Suppressed efficiency roll-off in blue light-emitting diodes by balancing the spatial charge distribution

2020 ◽  
Vol 8 (37) ◽  
pp. 12927-12934
Author(s):  
Fangfang Wang ◽  
Huimin Zhang ◽  
Qingli Lin ◽  
Jiaojiao Song ◽  
Huaibin Shen ◽  
...  
Keyword(s):  
Charge Distribution ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Spatial Charge ◽  
Bright Blue ◽  
Peak Value

Suppressed efficiency roll-off and bright blue QLEDs have been demonstrated by using propanethiol-modified ZnCdSeS QDs as the emitting layers. Their EQE can be sustained at >75% of the peak value in the range of 100–10 000 cd m−2.

Synthesis and Luminescent Properties of Blue-Emitting Hydrotalcite-Like Compound for NUV Light-Emitting Diodes

2014 ◽  
Vol 1004-1005 ◽  
pp. 340-343
Author(s):  
Chen Hong ◽  
Hui Gao ◽  
Zhao Xuan ◽  
Li Hong Jiang ◽  
Qi Dan Ling
Keyword(s):  
Fluorescence Spectrum ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Luminescent Properties ◽  
Coprecipitation Method ◽  
White Led ◽  
Hybrid Nanocomposite ◽  
Inorganic Hybrid ◽  
Light Emitting ◽  
Bright Blue

Layered organic-inorganic hybrid nanocomposite material with the hydrotalcite-like structure, containing Mg (II),Zn (II) and Al (III) in the layers, and salicylate ions in the interlayer, have been prepared by a simple coprecipitation method (MgAlZn-sal-HTlc). Fluorescence spectrum, XRD and TG were used to characterize the properties of the sample. Additionally, A LED device was fabricated by coating MgAlZn-sal-HTlc onto InGaN-based LED chip. The device emits bright blue light. All the results indicate that blue-emitting fluorescent hydrotalcite-like compound can act as blue components in the fabrication of white LED.

Nucleation-Controlled Growth of Ultra-Small Perovskite Quantum Dots for Bright Blue Light-Emitting Diodes

2021 ◽  
Author(s):  
Limin Wu ◽  
Shuhua Tu ◽  
Min Chen
Keyword(s):  
Quantum Dots ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Controlled Growth ◽  
Light Emitting ◽  
Highly Efficient ◽  
Synthesis Strategy ◽  
Perovskite Quantum Dots ◽  
Effective Synthesis ◽  
Bright Blue

Creating highly efficient and stable pure blue (≈ 470 nm) perovskite quantum dots (PQDs) remains a considerable challenge. Here, we report an effective synthesis strategy of ultra-small (≈ 3.8 nm)...

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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