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1.
Chem Commun (Camb) ; 54(59): 8206-8209, 2018 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-29978160

RESUMO

Multicolor mechanoluminescence (ML) was first realized by using the stable organic blue ML emitter N-phenylcarbazole as the host matrix. It is claimed that a good ML host should have a moderate melting point and be able to dissolve or disperse organic dyes but maintain high ML activity and crystallinity. This strategy is versatile and can avoid difficult molecular design and troublesome chemical synthesis.

2.
Chem Commun (Camb) ; 54(41): 5225-5228, 2018 May 17.
Artigo em Inglês | MEDLINE | ID: mdl-29726562

RESUMO

Simple N-phenylcarbazole (NPC) could readily form brightly mechanofluorescent crystals with mechanically touch-sensitive response, regardless of crystallization methods. NPC with room-temperature photophosphorescence did not exhibit mechano-phosphorescence, signifying that the excitation modes could play an important role in affecting light-emitting processes.

3.
ACS Appl Mater Interfaces ; 6(11): 8345-52, 2014 Jun 11.
Artigo em Inglês | MEDLINE | ID: mdl-24840940

RESUMO

Highly efficient, solution-processed, and all fluorescent white organic light-emitting diodes (WOLEDs) based on fluorescent small molecules have been achieved by incorporating a low-conductivity hole injection layer and an inorganic-organic hybrid electron injection layer. The light-emission layer is created by doping a fluorescent π-conjugated blue dendrimer host (the zeroth generation dendrimer, G0) with a yellow-emitting fluorescent dopant oligo(paraphenylenevinylene) derivative CN-DPASDB with a doping ratio of 100:0.15 (G0:CN-DPASDB) by weight. To suppress excessive holes, the high-conductivity hole injection layer (PEDOT:PSS AI 4083) is replaced by the low-conductivity PEDOT:PSS CH 8000. To facilitate the electron injection, a hybrid electron injection layer is introduced by doping a methanol/water-soluble conjugated polymer poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFNR2) with solution-processed cesium fluoride (CsF). The device achieves a maximum luminous efficiency of 17.0 cd A(-1) and a peak power efficiency of 15.6 lm W(-1) at (0.32, 0.37) with a color rendering index of 64.

4.
Adv Mater ; 25(25): 3443-8, 2013 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-23696222

RESUMO

Film-like conjugated microporous polymers (CMPs) are fabricated by the novel strategy of carbazole-based electropolymerization. The CMP film storing a mass of counterions acting as an anode interlayer provides a significant power-conversion efficiency of 7.56% in polymer solar cells and 20.7 cd A(-1) in polymer light-emitting diodes, demonstrating its universality and potential as an electrode interlayer in organic electronics.

5.
Chem Commun (Camb) ; 49(51): 5730-2, 2013 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-23549385

RESUMO

D-A compounds constructed from a novel building block 5,5'-bibenzo[c][1,2,5]thiadiazole (BBTz) possess a special configuration of swivel cruciform, which exhibits promising potential in the solution-processed small molecule optoelectronic devices, e.g. OSCs and OLEDs.

6.
Chemistry ; 18(9): 2707-14, 2012 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-22282319

RESUMO

In this paper, we describe a bipolar molecular design for small molecule solution-processed organic light emitting diodes (OLEDs). Combining the rigidity of the conjugated emissive cores and the flexibility of the peripheral alkyl-linked carbazole groups, two series of highly efficient bipolar RGB (red, green, blue) emitters have been synthesized and characterized. The emissive cores are composed of electron-withdrawing groups; the carbazole groups endow the materials electron-donating units. Such bipolar structures are advantageous for the carrier injection and balance. Four peripheral carbazole groups are introduced in T-series materials (TCDqC, TCSoC, TCBzC, TCNzC), and another four in O-series materials (OCDqC, OCSoC, OCBzC, OCNzC). With the single-layer device configuration of ITO/PEDOT:PSS/emitting layer/CsF/Al, two green devices exhibited excellent performance with a maximum luminescence efficiency of over 6.4 cd A(-1), and a high maximum luminance of more than 6700 cd m(-2). In addition, compared with the T-series, the luminescence efficiency of blue and red devices based on O-series materials increased from 1.6 to 2.8 cd A(-1) and 0.2 to 1.3 cd A(-1), respectively. To our knowledge, the performance of the blue device based on OCSoC is among the best of the blue small-molecule solution-processed single-layer devices reported so far.

8.
Chem Commun (Camb) ; 46(22): 3923-5, 2010 Jun 14.
Artigo em Inglês | MEDLINE | ID: mdl-20424781

RESUMO

A series of new bipolar solution-processable RGB materials are designed by considering the solubility, morphology, fluorescence efficiency and carriers balance. Solution-processable OLEDs are fabricated with high efficiencies, especially, the green TCBzC-based device shows the maximum luminous efficiency of 31.6 cd A(-1), which is among the best reported values.

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