Zn[Formula: see text]Ni[Formula: see text]Te semiconductor nanocrystals in transparent glass for optoelectronic device applications.
Sci Rep
; 13(1): 7627, 2023 May 10.
Article
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| MEDLINE
| ID: mdl-37165027
ABSTRACT
Doping glass with semiconductors, particularly with nanostructured semiconductors, has attracted attention due to the large optical absorption cross-sections of the latter. Based on this property, Ni[Formula see text] (5 wt%) doped phosphate glass and Zn[Formula see text]Ni[Formula see text]Te (x = 0.5, 1.0, 5.0 and 10.0 wt% of Ni[Formula see text]) nanocrystals (NCs) doped phosphate glasses (GCs) were prepared by fusion method and subsequent heat treatment. Influence of Ni[Formula see text] on structural, thermo-optical and third-order nonlinear optical properties have been analysed through various spectroscopic characterizations. The XRD pattern of the glass (G) exhibits the amorphous nature of the host material while GCs exhibit not only amorphous halo but also the presence of quantum dots (QDs) or nanocrystals (NCs) phases. TEM analysis of the studied GCs samples confirm the presence of quantum dots (QDs) and bulk NCs with an average diameter of approximately 4.2 [Formula see text] 0.3 nm and 13.4 [Formula see text] 0.2 nm, respectively. Several phosphate groups were observed and reported from Raman and FTIR-ATR spectra. The absorption band positions confirmed that Ni[Formula see text] ions resemble to the octahedral symmetry. The intensity of absorption band around 1352 nm ([Formula see text]T[Formula see text](F) [Formula see text] [Formula see text]A[Formula see text](F)) increased with the increase of Ni[Formula see text] in GCs which is an indicative of the [Formula see text]Ni[Formula see text] coordination. The emission properties such as emission cross-sections ([Formula see text]) full width at half maxima (FWHM) for the [Formula see text]T[Formula see text](D) [Formula see text] [Formula see text]T[Formula see text](F) (visible) and [Formula see text]A[Formula see text](F) [Formula see text] [Formula see text]T[Formula see text](F) (near-infrared) emission transitions were reported. Among the glass-containing semiconductor nanocrystals (GCs), the emission cross-sections in GC4 sample (x = 10% of Ni[Formula see text]) are the largest for both the visible (11.88 [Formula see text] 10[Formula see text] cm[Formula see text]) and infrared (0.98 [Formula see text] 10[Formula see text] cm[Formula see text]) transitions. Thermal diffusivity (D), thermal conductivity (K) and temperature dependent optical path length change (ds/dT) were obtained through time-resolved thermal lens (TL) and thermal relaxation (TR) methods. The D and K parameters do not change significantly with increase of Ni[Formula see text] ions (0.5-5%) in GCs. Nonlinear-refractive index and nonlinear absorption of the studied samples were also obtained using femtosecond Z-scan technique. The increase of nonlinear absorption coefficient ([Formula see text]) is observed from GC2 (2.53 [Formula see text] 10[Formula see text] cm/W) to GC4 (7.98 [Formula see text] 10[Formula see text] cm/W). The GC4, sample with 10 wt% of Ni[Formula see text], showed the lowest ds/dT (1.22 [Formula see text] 10[Formula see text] K[Formula see text]) with good lasing (FOM and emission cross-sections) and nonlinear absorption properties suggesting that it can be a good candidate for visible-red emission light conversion in LED technology.
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Colección:
01-internacional
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MEDLINE
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En
Revista:
Sci Rep
Año:
2023
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Article