Bright and Color-Stable Blue-Light-Emitting Diodes based on Three-Dimensional Perovskite Polycrystalline Films via Morphology and Interface Engineering

2020 ◽  
Vol 11 (4) ◽  
pp. 1411-1418 ◽  
Author(s):  
Hailong Wang ◽  
Yushuai Xu ◽  
Jiang Wu ◽  
Liang Chen ◽  
Qingqing Yang ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Interface Engineering ◽  
Polycrystalline Films ◽  
Light Emitting

Three-dimensional graphene foam-based transparent conductive electrodes in GaN-based blue light-emitting diodes

2013 ◽  
Vol 102 (16) ◽  
pp. 161902 ◽  
Author(s):  
Byung-Jae Kim ◽  
Gwangseok Yang ◽  
Min Joo Park ◽  
Joon Seop Kwak ◽  
Kwang Hyeon Baik ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Graphene Foam ◽  
Light Emitting ◽  
Transparent Conductive Electrodes

scholarly journals Mixed halide perovskites for spectrally stable and high-efficiency blue light-emitting diodes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Max Karlsson ◽  
Ziyue Yi ◽  
Sebastian Reichert ◽  
Xiyu Luo ◽  
Weihua Lin ◽  
...  
Keyword(s):  
Blue Light ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Blue Emission ◽  
Chloride Content ◽  
Practical Implementation ◽  
Light Emitting ◽  
Wide Range ◽  
Halide Perovskites

AbstractBright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition is straightforward to achieve blue emission, practical implementation of this strategy has been challenging due to poor colour stability and severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content needed to produce blue emission. Here, we solve these critical challenges in mixed halide perovskites and demonstrate spectrally stable blue perovskite light-emitting diodes over a wide range of emission wavelengths from 490 to 451 nanometres. The emission colour is directly tuned by modifying the halide composition. Particularly, our blue and deep-blue light-emitting diodes based on three-dimensional perovskites show high EQE values of 11.0% and 5.5% with emission peaks at 477 and 467 nm, respectively. These achievements are enabled by a vapour-assisted crystallization technique, which largely mitigates local compositional heterogeneity and ion migration.

Blue light-emitting diodes in hair regrowth: the first prospective study

2021 ◽  
Author(s):  
G. Lodi ◽  
M. Sannino ◽  
G. Cannarozzo ◽  
A. Giudice ◽  
E. Del Duca ◽  
...  
Keyword(s):  
Prospective Study ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Hair Regrowth

scholarly journals Air stable and highly efficient Bi3+-doped Cs2SnCl6 for blue light-emitting diodes

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26415-26420
Author(s):  
Yue Yao ◽  
Si-Wei Zhang ◽  
Zijian Liu ◽  
Chun-Yun Wang ◽  
Ping Liu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Color Coordinates ◽  
Blue Led ◽  
Highly Efficient ◽  
Photoluminescence Quantum Yield ◽  
Long Life

A Bi3+-doped Cs2SnCl6 exhibits photoluminescence at around 456 nm and a photoluminescence quantum yield of 31%. The blue LED based on the Bi3+-doped Cs2SnCl6 phosphor exhibits a long life of 120 hours and a CIE color coordinates of (0.14, 0.11).

scholarly journals Device Modeling of Quantum Dot–Organic Light Emitting Diodes for High Green Color Purity

2021 ◽  
Vol 11 (6) ◽  
pp. 2828
Author(s):  
Byoung-Seong Jeong
Keyword(s):  
Quantum Dot ◽  
Emission Spectrum ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Wavelength Band ◽  
Light Emitting ◽  
Green Color ◽  
Organic Light

In this study, the optimal structure for obtaining high green color purity was investigated by modeling quantum dot (QD)–organic light-emitting diodes (OLED). It was found that even if the green quantum dot (G-QD) density in the G-QD layer was 30%, the full width at half maximum (FWHM) in the green wavelength band could be minimized to achieve a sharp emission spectrum, but it was difficult to completely block the blue light leakage with the G-QD layer alone. This blue light leakage problem was solved by stacking a green color filter (G-CF) layer on top of the G-QD layer. When G-CF thickness 5 μm was stacked, blue light leakage was blocked completely, and the FWHM of the emission spectrum in the green wavelength band was minimized, resulting in high green color purity. It is expected that the overall color gamut of QD-OLED can be improved by optimizing the device that shows such excellent green color purity.

High-Bright InGaN Multiple-Quantum-Well Blue Light-Emitting Diodes on Si (111) Using AlN/GaN Multilayers with a Thin AlN/AlGaN Buffer Layer

2003 ◽  
Vol 42 (Part 2, No. 3A) ◽  
pp. L226-L228 ◽  
Author(s):  
Baijun Zhang ◽  
Takashi Egawa ◽  
Hiroyasu Ishikawa ◽  
Yang Liu ◽  
Takashi Jimbo
Keyword(s):  
Quantum Well ◽  
Buffer Layer ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
Light Emitting ◽  
Algan Buffer
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