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1.
Small ; 19(27): e2207165, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-36974597

RESUMO

Photoactivated gas sensors that are fully integrated with micro light-emitting diodes (µLED) have shown great potential to substitute conventional micro/nano-electromechanical (M/NEMS) gas sensors owing to their low power consumption, high mechanical stability, and mass-producibility. Previous photoactivated gas sensors mostly have utilized ultra-violet (UV) light (250-400 nm) for activating high-bandgap metal oxides, although energy conversion efficiencies of gallium nitride (GaN) LEDs are maximized in the blue range (430-470 nm). This study presents a more advanced monolithic photoactivated gas sensor based on a nanowatt-level, ultra-low-power blue (λpeak  = 435 nm) µLED platform (µLP). To promote the blue light absorbance of the sensing material, plasmonic silver (Ag) nanoparticles (NPs) are uniformly coated on porous indium oxide (In2 O3 ) thin films. By the plasmonic effect, Ag NPs absorb the blue light and spontaneously transfer excited hot electrons to the surface of In2 O3 . Consequently, high external quantum efficiency (EQE, ≈17.3%) and sensor response (ΔR/R0 (%) = 1319%) to 1 ppm NO2 gas can be achieved with a small power consumption of 63 nW. Therefore, it is highly expected to realize various practical applications of mobile gas sensors such as personal environmental monitoring devices, smart factories, farms, and home appliances.

2.
Light Sci Appl ; 12(1): 95, 2023 Apr 18.
Artigo em Inglês | MEDLINE | ID: mdl-37072383

RESUMO

Electronic nose (e-nose) technology for selectively identifying a target gas through chemoresistive sensors has gained much attention for various applications, such as smart factory and personal health monitoring. To overcome the cross-reactivity problem of chemoresistive sensors to various gas species, herein, we propose a novel sensing strategy based on a single micro-LED (µLED)-embedded photoactivated (µLP) gas sensor, utilizing the time-variant illumination for identifying the species and concentrations of various target gases. A fast-changing pseudorandom voltage input is applied to the µLED to generate forced transient sensor responses. A deep neural network is employed to analyze the obtained complex transient signals for gas detection and concentration estimation. The proposed sensor system achieves high classification (~96.99%) and quantification (mean absolute percentage error ~ 31.99%) accuracies for various toxic gases (methanol, ethanol, acetone, and nitrogen dioxide) with a single gas sensor consuming 0.53 mW. The proposed method may significantly improve the efficiency of e-nose technology in terms of cost, space, and power consumption.

3.
Sci Rep ; 12(1): 7955, 2022 May 13.
Artigo em Inglês | MEDLINE | ID: mdl-35562422

RESUMO

We propose a key factor associated with both surface recombination velocity and radiative efficiency of an LED to estimate its chip size-dependent radiative efficiencies. The validity of the suggested factor is verified through experimental comparison between various LED wafers. Efficiencies of micro-LEDs from a blue and two green LED wafers are examined by temperature-dependent photoluminescence experiments. Surface recombination velocities are extracted from chip size dependent time-resolved PL results. Possible explanations on the reason why two green wafers show different properties are also given. With the suggested factor, we can provide more accurate prediction on the chip size-dependent efficiency of an LED wafer.

4.
ACS Sens ; 5(2): 563-570, 2020 02 28.
Artigo em Inglês | MEDLINE | ID: mdl-31922397

RESUMO

High-performance, monolithic photoactivated gas sensors based on the integration of gas-sensitive semiconductor metal oxide nanowires on micro light-emitting diodes (µLEDs) are introduced. The µLEDs showed improved irradiance and energy conversion efficiency (i.e., external quantum efficiency, EQE), as the size of LEDs was reduced from 200 × 200 µm2 (irradiance of 46.5 W/cm2 and EQE of 4%) to 30 × 30 µm2 (irradiance of 822.4 W/cm2 and EQE of 9%). Gas-sensitive zinc oxide (ZnO) nanowires were directly synthesized on top of the µLED through a hydrothermal reaction. The direct contact between the sensing component and µLED sensor platform leads to high light coupling efficiency, minimizing power consumption of the sensor. Furthermore, the sensing performance (i.e., sensitivity) at optimal operating power was improved as the LED size was reduced. The smallest fabricated gas sensor (active area = 30 × 30 µm2) showed excellent NO2 sensitivity (ΔR/R0 = 605% to 1 ppm NO2) at the optimal operating power (∼184 µW). In addition, the sensor showed a low limit of detection (∼14.9 ppb) and robustness to high humidity conditions, which demonstrate its potential for practical applications in mobile internet of things (IoT) devices.


Assuntos
Técnicas Biossensoriais/métodos , Óxido de Zinco/química
5.
Sci Rep ; 10(1): 15371, 2020 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-32958784

RESUMO

Optical polarization is an indispensable component in photonic applications, the orthogonality of which extends the degree of freedom of information, and strongly polarized and highly efficient small-size emitters are essential for compact polarization-based devices. We propose a group III-nitride quantum wire for a highly-efficient, strongly-polarized emitter, the polarization anisotropy of which stems solely from its one-dimensionality. We fabricated a site-selective and size-controlled single quantum wire using the geometrical shape of a three-dimensional structure under a self-limited growth mechanism. We present a strong and robust optical polarization anisotropy at room temperature emerging from a group III-nitride single quantum wire. Based on polarization-resolved spectroscopy and strain-included 6-band k·p calculations, the strong anisotropy is mainly attributed to the anisotropic strain distribution caused by the one-dimensionality, and its robustness to temperature is associated with an asymmetric quantum confinement effect.

6.
ACS Appl Mater Interfaces ; 12(1): 1944-1952, 2020 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-31815412

RESUMO

Because of its excellent optical properties and good stability, all-inorganic halide perovskite CsPbX3 (X = I, Br, Cl) has been attracting interest for use in light-emitting diodes (LEDs). One challenge is improving the efficacy of the spatial confinement of excitons for higher luminescence efficiency. Here, we present a simple yet very effective strategy to form fine-grain-structured CsPbBr3 polycrystalline films prepared by thermal co-evaporation. The strategy involves controlling growth kinetics by adjusting the deposition rate, which, along with growth temperature, determines the nucleation rate and therefore the eventual grain structure. A correlation between deposition rate and average grain size was noted except for a very large deposition rate when there were large hillocks, which we attributed to the peculiar growth behavior of PbBr2 films. The growth conditions that produced a nanoscale grain structure and textured orientations without large hillocks also resulted in the highest luminescence efficiency as we anticipated. With the optimized CsPbBr3 light emitters, we demonstrate a green-light-emitting (at 524 nm) LED with a maximum current efficiency of 1.07 cd/A and an extremely narrow electroluminescence spectrum of 18 nm, a result that highlights the potential of vacuum-processed CsPbBr3 films for high-efficiency LEDs.

7.
Nanoscale ; 12(41): 21392-21400, 2020 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-33078822

RESUMO

The hybridised resonances between Mie-scatterers and lattice resonances, i.e. quasi-guided mode resonances, are investigated. The scattering of the Mie-resonators is improved by the first order of transmitted diffracted light which is coupled to the lattice formed by the Mie-resonators. The conditions of coupling are dependent on the refractive index of the substrate and the effective refractive index of the unit cell of the resonators. Based on the momentum matching conditions, the cut-off wavelength of coupling and the amount of the amplification can be controlled. As a proof-of-concept application of this framework, gallium nitride metasurfaces are designed to produce metasurfaces that display structural colour. Palettes of full spectral colour and gradients are successfully demonstrated. The hue of the colour can be controlled by changing the periodicity of the unit cell at a fixed filling ratio of Mie-scatterer radius to unit cell periodicity, since the increase in periodicity redshifts the cut-off wavelength of the lattice resonance conditions, identified as the Rayleigh anomaly. The brightness of the colour can be tuned by adjusting the filling ratio of the unit cell. Consequently, the proposed framework may provide a fundamental guideline to design spectral filters made up of low-index Mie-scatterers for various applications.

8.
Sci Rep ; 10(1): 7506, 2020 May 05.
Artigo em Inglês | MEDLINE | ID: mdl-32371935

RESUMO

A discrete core-shell-like micro-light-emitting diode (micro-LED) array was grown on a 100 nm-thick sapphire nano-membrane array without harmful plasma etching for chip singulation. Due to proper design for the sapphire nano-membrane array, an array of multi-faceted micro-LEDs with size of 4 µm × 16 µm was grown. Threading dislocation density in the micro-LED formed on sapphire nano-membrane was reduced by 59.6% due to the sapphire nano-membranes, which serve as compliant substrates, compared to GaN formed on a planar substrate. Enhancements in internal quantum efficiency by 44% and 3.3 times higher photoluminescence intensity were also observed from it. Cathodoluminescence emission at 435 nm was measured from c-plane multiple quantum wells (MQWs), whereas negligible emissions were detected from semi-polar sidewall facets. A core-shell-like MQWs were formed on all facets, hopefully lowering concentration of non-radiative surface recombination centers and reducing leakage current paths. This study provides an attractive platform for micro-LEDs by using sapphire nano-membrane.

9.
Nanoscale Adv ; 2(4): 1449-1455, 2020 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-36132295

RESUMO

Group III-nitride semiconductor-based ultraviolet (UV) light emitting diodes have been suggested as a substitute for conventional arc-lamps such as mercury, xenon and deuterium arc-lamps, since they are compact, efficient and have a long lifetime. However, in previously reported studies, group III-nitride UV light emitting diodes did not show a broad UV spectrum range as conventional arc-lamps, which restricts their application in fields such as medical therapy and UV spectrophotometry. Here, we propose GaN quantum dots (QDs) grown on different facets of hexagonal truncated pyramid structures formed on a conventional (0001) sapphire substrate. A hexagonal truncated GaN pyramid structure includes {101̄1} semipolar facets as well as a (0001) polar facet, which have intrinsically different piezoelectric fields and growth rates of GaN QDs. Consequently, we successfully demonstrated a plateau-like broadband UV spectrum ranging from ∼400 nm (UV-A) to ∼270 nm (UV-C) from the GaN QDs. In addition, at the top-edge of the truncated pyramid structure, a strain was locally suppressed compared to the center of the truncated pyramid structure. As a result, various emission wavelengths in the UV range were achieved from the GaN QDs grown on the sidewall, top-edge and top-center of hexagonal truncated pyramid structures, which ultimately provide a broadband UV spectrum with high efficiency.

10.
Nanoscale ; 10(10): 4686-4695, 2018 Mar 08.
Artigo em Inglês | MEDLINE | ID: mdl-29393959

RESUMO

Warm and natural white light (i.e., with a correlated colour temperature <5000 K) with good colour rendition (i.e., a colour rendering index >75) is in demand as an indoor lighting source of comfortable interior lighting and mood lighting. However, for warm white light, phosphor-converted white light-emitting diodes (WLEDs) require a red phosphor instead of a commercial yellow phosphor (YAG:Ce3+), and suffer from limitations such as unavoidable energy conversion losses, degraded phosphors and high manufacturing costs. Phosphor-free WLEDs based on three-dimensional (3D) indium gallium nitride (InGaN)/gallium nitride (GaN) structures are promising alternatives. Here, we propose a new concept for highly efficient phosphor-free warm WLEDs using 3D core-shell InGaN/GaN dodecagonal ring structures, fabricated by selective area growth and the KOH wet etching method. Electrically driven, phosphor-free warm WLEDs were successfully demonstrated with a low correlated colour temperature (4500 K) and high colour rendering index (Ra = 81). From our findings, we believe that WLEDs based on dodecagonal ring structures become a platform enabling a high-efficiency warm white light-emitting source without the use of phosphors.

11.
Sci Rep ; 7(1): 9356, 2017 08 24.
Artigo em Inglês | MEDLINE | ID: mdl-28839283

RESUMO

Control of the growth front in three-dimensional (3D) hexagonal GaN core structures is crucial for increased performance of light-emitting diodes (LEDs), and other photonic devices. This is due to the fact that InGaN layers formed on different growth facets in 3D structures exhibit various band gaps which originate from differences in the indium-incorporation efficiency, internal polarization, and growth rate. Here, a-plane {[Formula: see text] } facets, which are rarely formed in hexagonal pyramid based growth, are intentionally fabricated using mask patterns and adjustment of the core growth conditions. Moreover, the growth area covered by these facets is modified by changing the growth time. The origin of the formation of a-plane {[Formula: see text]} facets is also discussed. Furthermore, due to a growth condition transition from a 3D core structure to an InGaN multi-quantum well, a growth front transformation (i.e., a transformation of a-plane {[Formula: see text]} facets to semi-polar {[Formula: see text]} facets) is directly observed. Based on our understanding and control of this novel growth mechanism, we can achieve efficient broadband LEDs or photovoltaic cells.

12.
J Invest Dermatol ; 121(3): 607-13, 2003 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12925222

RESUMO

Ginsenosides, the major active ingredients of ginseng, show a variety of biomedical efficacies such as antiaging and antioxidation. Here, we investigate the protective activity of the ginsenoside F1, an enzymatically modified derivative of ginsenoside Rg1, against ultraviolet-B-induced damage in human HaCaT keratinocytes. Ginsenoside F1 significantly reduced ultraviolet-B-induced cell death and protected HaCaT cells from apoptosis caused by ultraviolet B irradiation. Furthermore, ginsenoside F1 prevented ultraviolet-B-induced cleavage of poly(ADP-ribose) polymerase in HaCaT cells. In search of the molecular mechanism responsible for the antiapoptotic effect of ginsenoside F1, we find that protection from ultraviolet-B-induced apoptosis is tightly correlated with ginsenoside-F1-mediated inhibition of ultraviolet-B-induced downregulation of Bcl-2 and Brn-3a expression.


Assuntos
Apoptose/efeitos dos fármacos , Apoptose/efeitos da radiação , Ginsenosídeos/farmacologia , Queratinócitos/efeitos dos fármacos , Queratinócitos/efeitos da radiação , Proteínas Proto-Oncogênicas c-bcl-2/genética , Linhagem Celular , Proteínas de Ligação a DNA/metabolismo , Relação Dose-Resposta a Droga , Regulação para Baixo/efeitos dos fármacos , Regulação para Baixo/efeitos da radiação , Células Epidérmicas , Expressão Gênica/efeitos dos fármacos , Expressão Gênica/efeitos da radiação , Humanos , Queratinócitos/citologia , Regiões Promotoras Genéticas/fisiologia , Regiões Promotoras Genéticas/efeitos da radiação , Fator de Transcrição Brn-3 , Fator de Transcrição Brn-3A , Fatores de Transcrição/metabolismo , Transcrição Gênica/efeitos dos fármacos , Transcrição Gênica/efeitos da radiação , Raios Ultravioleta/efeitos adversos
14.
Int J Urol ; 12(4): 383-9, 2005 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-15948727

RESUMO

BACKGROUND: Chronic bacterial prostatitis (CBP) is the most common urological disease in adult men. Antibiotic therapy is the gold standard of treatment. However, long-term therapy resulted in many side-effects and bacterial resistance. Because of these reasons, we need new treatment modality that could replace traditional antibiotic therapy. Catechin, an extract of green tea, has antimicrobial effect against various bacteria and synergy effect to antibiotics. We evaluate the synergistic effects of catechin on the treatment of CBP in an animal model. METHODS: An experimental CBP model was induced in 70 male Wistar rats by instillation of 0.2 mL bacterial suspension (E-coli Z17, O2:K1:H-) containing 1 x 10(8) CFU/mL into the prostatic urethra. Microbiologically and histologically proven CBP model was demonstrated in 58.6% (41 of 70) of the rats after 4 weeks of bacterial instillation. The 41 rats demonstrating CBP were randomly divided into four groups; the control, catechin, ciprofloxacin and catechin with ciprofloxacin groups. All drug treatments were conducted over a period of 2 weeks. After treatment, the results were analyzed with microbiological cultures and histological findings of the prostate and urine samples to compare each group. RESULTS: Microbiological cultures and histological findings of the prostate and urine samples demonstrated reduced bacterial growth and improved inflammatory responses in all three experimental groups compared with the control group. The catechin group showed coherent trends of decrease in bacterial growth and improvements in prostatic inflammation compared with the control group, but not to a statistically significant degree (P > 0.05). However, the ciprofloxacin and catechin with ciprofloxacin groups showed statistically significant decreases in bacterial growth and improvements in prostatic inflammation compared with the control group (P < 0.05). The catechin with ciprofloxacin group showed a statistically significant decrease in bacterial growth and improvements in prostatic inflammation compared with the ciprofloxacin group (P < 0.05). CONCLUSIONS: These results suggest that catechin may be an effective material in CBP treatment. Particularly, combination treatment of catechin and ciprofloxacin has synergistic effect. Therefore, we suggest that the combination of catechin and ciprofloxacin may be effective in treating CBP with a higher success rate.


Assuntos
Anti-Infecciosos/uso terapêutico , Catequina/uso terapêutico , Ciprofloxacina/uso terapêutico , Infecções por Escherichia coli/tratamento farmacológico , Prostatite/tratamento farmacológico , Animais , Doença Crônica , Contagem de Colônia Microbiana , Modelos Animais de Doenças , Escherichia coli/isolamento & purificação , Infecções por Escherichia coli/microbiologia , Seguimentos , Masculino , Próstata/microbiologia , Próstata/patologia , Prostatite/microbiologia , Prostatite/patologia , Distribuição Aleatória , Ratos , Ratos Wistar , Resultado do Tratamento , Urina/microbiologia
15.
J Am Coll Nutr ; 23(2): 157-62, 2004 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-15047682

RESUMO

OBJECTIVE: This study investigated the anti-aging effects of dietary isoflavones on photoaged hairless mouse skin. METHODS: Female hairless mice were administered soy isoflavone extract orally and irradiated with UV light for four weeks. The effects of the isoflavones on the skin appearance, collagen deposition and epidermal thickness in the UV-damaged mouse skin were measured using bioengineering and histochemical methods. In addition, the influence of the isoflavones on the collagen metabolism in the UVB-irradiated human skin fibroblasts was also investigated. RESULTS: In the isoflavone treated group, the skin had a better appearance and less wrinkling than that of the control group. Additionally, the amount of collagen deposition was higher in the isoflavone group. In the human fibroblast cells, the amount of procollagen de novo synthesized did not increase after isoflavone treatment and/or UV irradiation. However, the increase in the expression of the metalloproteinases (MMPs) as a result of UV irradiation was suppressed by the isoflavone treatment. CONCLUSIONS: It appears that isoflavones had an anti-aging effect on the UV-damaged hairless mice model, which is partly due to the inhibitory effects on UV-induced MMP-1 expression and the subsequent collagen degradation.


Assuntos
Colágeno/metabolismo , Fibroblastos/metabolismo , Isoflavonas/farmacologia , Pele/patologia , Administração Oral , Animais , Células Cultivadas , Colágeno/efeitos dos fármacos , Colágeno/efeitos da radiação , Feminino , Fibroblastos/efeitos dos fármacos , Fibroblastos/efeitos da radiação , Humanos , Imuno-Histoquímica , Metaloproteases/metabolismo , Camundongos , Camundongos Pelados , Distribuição Aleatória , Pele/efeitos dos fármacos , Pele/efeitos da radiação , Raios Ultravioleta/efeitos adversos
16.
J Nutr ; 133(11 Suppl 1): 3805S-3810S, 2003 11.
Artigo em Inglês | MEDLINE | ID: mdl-14608118

RESUMO

Green tea polyphenols are reported to possess substantial antiinflammatory and chemopreventive properties. However, the molecular mechanism of chemopreventive activity of green tea polyphenols is not fully understood. An abnormally elevated level of cyclooxygenase-2 (COX-2) is implicated in the pathogenesis of carcinogenesis. In the present study, we found that pretreatment of the green tea extract enriched with catechin and epigallocatechin gallate (EGCG) by gavage inhibited COX-2 expression induced by the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) in mouse skin. Similarly, EGCG downregulated COX-2 in TPA-stimulated human mammary epithelial cells (MCF-10A) in culture. To further elucidate the underlying mechanism of COX-2 inhibition by green tea extract and EGCG, we examined their effects on the activation of extracellular signal-regulated protein kinase (ERK) and p38 mitogen-activated protein kinase (MAPK), which are upstream enzymes known to regulate COX-2 expression in many cell types. Pretreatment with EGCG as well as green tea extract caused a decrease in the activation of ERK. In addition, EGCG inhibited the catalytic activity of ERK and p38 MAPK, suggesting that these signal-transducing enzymes could be potential targets for previously reported antitumor promoting activity of EGCG.


Assuntos
Mama/citologia , Catequina/análogos & derivados , Catequina/farmacologia , Inibidores de Ciclo-Oxigenase/farmacologia , Células Epiteliais/citologia , Isoenzimas/genética , Prostaglandina-Endoperóxido Sintases/genética , Pele/enzimologia , Acetato de Tetradecanoilforbol/toxicidade , Animais , Anticarcinógenos/farmacologia , Linhagem Celular , Ciclo-Oxigenase 2 , Inibidores de Ciclo-Oxigenase 2 , Células Epiteliais/efeitos dos fármacos , Feminino , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Humanos , Isoenzimas/efeitos dos fármacos , Proteínas de Membrana , Camundongos , Camundongos Endogâmicos ICR , Prostaglandina-Endoperóxido Sintases/efeitos dos fármacos , Pele/efeitos dos fármacos , Chá , Acetato de Tetradecanoilforbol/antagonistas & inibidores
17.
Biochem Biophys Res Commun ; 316(2): 348-55, 2004 Apr 02.
Artigo em Inglês | MEDLINE | ID: mdl-15020224

RESUMO

Ginsenosides, the major active ingredients of ginseng, have a variety of biomedical efficacies such as anti-aging, anti-oxidation, and anti-inflammatory activities. To understand the effects of compound K (20-O-beta-D-glucopyranosyl-20(S)-protopanaxadiol), one of the major metabolites of ginsenosides, on the skin, we assessed the expression levels of about 100 transcripts in compound K-treated HaCaT cells using cDNA microarray analysis. One gene up-regulated by compound K was hyaluronan synthase2 (HAS2). Semi-quantitative RT-PCR showed that compound K increased HAS2 mRNA in time- and dose-dependent manners. ELISA and immunocytochemistry using hyaluronan (HA)-binding protein showed that compound K effectively increased HA production in HaCaT cells. Finally, treatment of compound K on hairless mouse skin increased the amount of HA in the epidermis and papillary dermis. Our study suggests that topical application of compound K might prevent or improve the deteriorations, such as xerosis and wrinkles, partly ascribed to the age-dependent decrease of the HA content in human skin.


Assuntos
Ginsenosídeos/farmacologia , Glucuronosiltransferase/biossíntese , Ácido Hialurônico/biossíntese , Queratinócitos/metabolismo , Pele/metabolismo , Animais , Linhagem Celular , Linhagem Celular Transformada , Epiderme/anatomia & histologia , Epiderme/efeitos dos fármacos , Expressão Gênica/efeitos dos fármacos , Perfilação da Expressão Gênica , Ginsenosídeos/química , Glucuronosiltransferase/genética , Humanos , Hialuronan Sintases , Queratinócitos/citologia , Camundongos , Camundongos Pelados , Pele/anatomia & histologia , Regulação para Cima
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