scholarly journals Harnessing spectral property of dual wavelength white LED to improve vertical scanning interferometry

2013 ◽  
Vol 52 (19) ◽  
pp. 4652 ◽  
Author(s):  
Wee Keat Chong ◽  
Xiang Li ◽  
Yeng Chai Soh
Keyword(s):  
Spectral Property ◽  
Dual Wavelength ◽  
White Led ◽  
Vertical Scanning Interferometry

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.

A Study of Optical Properties of a Glass Composition of a ZnO-Bi2O3-P2O5 Glass/Phosphor Composite for a White LED

2015 ◽  
Vol 48 (6) ◽  
pp. 145-150
Author(s):  
Bong-Ki Ryu ◽  
Il-Gu Kim ◽  
Young-Seok Kim ◽  
Jong-Hwan Kim ◽  
Jae-Yeop Jung ◽  
...  
Keyword(s):  
Optical Properties ◽  
Glass Composition ◽  
White Led ◽  
Glass Phosphor

A transient macro model of GGNMOS used in white LED driver ESD protection simulation

2014 ◽  
Author(s):  
Yu-xi Jiang ◽  
Mao-ze Li ◽  
Jiao Li ◽  
Gao-chuang Bai ◽  
Yuan-zhang Guo ◽  
...  
Keyword(s):  
White Led ◽  
Led Driver ◽  
Macro Model ◽  
Esd Protection ◽  
White Led Driver

Single/dual-wavelength switchable and tunable passively Q-switched erbium-doped fiber laser

2020 ◽  
Vol 111 ◽  
pp. 103519
Author(s):  
Shuangcheng Chen ◽  
Baole Lu ◽  
Zengrun Wen ◽  
Haowei Chen ◽  
Jintao Bai
Keyword(s):  
Fiber Laser ◽  
Dual Wavelength ◽  
Erbium Doped

Dual wavelength laser-induced damage threshold measurements of alumina/silica and hafnia/silica ultraviolet antireflective coatings

2015 ◽  
Vol 55 (1) ◽  
pp. 104 ◽  
Author(s):  
Marius Mrohs ◽  
Lars Jensen ◽  
Stefan Günster ◽  
Thimotheus Alig ◽  
Detlev Ristau
Keyword(s):  
Damage Threshold ◽  
Dual Wavelength ◽  
Antireflective Coatings ◽  
Dual Wavelength Laser ◽  
Laser Induced Damage
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