Fabrication and performance of dual-wavelength white light-emitting diodes assisted with red-emitting nanocrystals

2014 ◽  
Author(s):  
Hong-Shuo Chen ◽  
Sheng-Shiun Chen ◽  
Kuan-Wen Wang ◽  
Shu-Ru Chung
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Dual Wavelength ◽  
Light Emitting ◽  
And Performance ◽  
White Light Emitting Diodes

Improved Yellow Light Emission in the Achievement of Dichromatic White Light Emitting Diodes

2013 ◽  
Vol 1538 ◽  
pp. 371-375
Author(s):  
Zhao Si ◽  
Tongbo Wei ◽  
Jun Ma ◽  
Ning Zhang ◽  
Zhe Liu ◽  
...  
Keyword(s):  
Blue Light ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Dual Wavelength ◽  
Emission Wavelength ◽  
White Led ◽  
Yellow Light ◽  
Light Emitting ◽  
White Light Emitting Diodes

ABSTRACTA study about the achievement of dichromatic white light-emitting diodes (LEDs) was performed. A series of dual wavelength LEDs with different last quantum-well (LQW) structure were fabricated. The bottom seven blue light QWs (close to n-GaN layer) of the four samples were the same. The LQW of sample A was 3 nm, and that of sample B, C and D were 6 nm, a special high In content ultra-thin layer was inserted in the middle of the LQW of sample C and on top of that of sample D. XRD results showed In concentration fluctuation and good interface quality of the four samples. PL measurements showed dual wavelength emitting, the blue light peak position of the four samples were almost the same, sample A with a narrower LQW showed an emission wavelength much shorter than that of sample B, C, D. EL measurement was done at an injection current of 100 mA. Sample A only showed LQW emission due to holes distribution. Because of wider LQW, the emission wavelength of sample B, C and D was longer and peak intensity was weaker. Sample D with insert layer on top of LQW showed strongest yellow light emission with a blue peak. As the injection current increased, sample A showed highest output light power due to narrower LQW. Of the other three samples with wider LQW, sample D showed highest output power. Effective yellow light emission has always been an obstacle to the achievement of dichromatic white LED. Sample D with insert layer close to p-GaN can confine the hole distribution more effectively hence the recombination of holes and electrons was enhanced, the yellow light emission was improved and dichromatic white LED was achieved.

Four-Wavelengths-Mixed White Light Emitting Diodes with Dual-Wavelength-Pumped Green and Red Phosphors

2008 ◽  
Vol 47 (8) ◽  
pp. 6317-6319
Author(s):  
Wei-Chih Lai ◽  
Jinn-Kong Sheu ◽  
Yi-Keng Fu ◽  
Cheng-Huang Kuo ◽  
Chi-Wen Kuo ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Dual Wavelength ◽  
Light Emitting ◽  
Red Phosphors ◽  
White Light Emitting Diodes

Solvent Effects on the Architecture and Performance of Polymer White-Light-Emitting Diodes with Conjugated Oligoelectrolyte Electron-Transport Layers

2008 ◽  
Vol 21 (5) ◽  
pp. 584-588 ◽  
Author(s):  
Yunhua Xu ◽  
Renqiang Yang ◽  
Junbiao Peng ◽  
Alexander A. Mikhailovsky ◽  
Yong Cao ◽  
...  
Keyword(s):  
Electron Transport ◽  
White Light ◽  
Solvent Effects ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
And Performance ◽  
White Light Emitting Diodes

Enhanced Cyan Emission and Optical Tuning of Ca 3 Ga 4 O 9 :Bi 3+ for High‐Quality Full‐Spectrum White Light‐Emitting Diodes

2020 ◽  
Vol 8 (22) ◽  
pp. 2001037 ◽  
Author(s):  
Dongjie Liu ◽  
Xiaohan Yun ◽  
Guogang Li ◽  
Peipei Dang ◽  
Maxim S. Molokeev ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
High Quality ◽  
Full Spectrum ◽  
Light Emitting ◽  
White Light Emitting Diodes

Glass-ceramic composites for high-power white-light-emitting diodes

2021 ◽  
Author(s):  
Alessandro Longato ◽  
Sebastiano Picco ◽  
Lorenzo Moro ◽  
Matteo Buffolo ◽  
Carlo De Santi ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Glass Ceramic ◽  
Light Emitting Diodes ◽  
Ceramic Composites ◽  
Light Emitting ◽  
White Light Emitting Diodes
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