Effect of an interlayer on the emission characteristics of a white‐light‐emitting electroluminescent device with a Pr and Ce doubly doped ZnS phosphor layer

1996 ◽  
Vol 79 (11) ◽  
pp. 8717-8724 ◽  
Author(s):  
Y. H. Lee ◽  
B. K. Ju ◽  
M. H. Song ◽  
T. S. Hahn ◽  
M. H. Oh ◽  
...  
Keyword(s):  
White Light ◽  
Emission Characteristics ◽  
Phosphor Layer ◽  
Light Emitting ◽  
Electroluminescent Device

scholarly journals (Y,Gd)BO3:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

2021 ◽  
Vol 10 (4) ◽  
pp. 1930-1935
Author(s):  
Phan Xuan Le ◽  
Le Hung Tien
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Phosphor Layer ◽  
Light Emitting ◽  
Conformal Coating ◽  
Color Quality ◽  
Remote Phosphor ◽  
White Light Emitting Diodes ◽  
Color Rendering

Among the structures using for fabricating white light-emitting diodes (WLEDs) such as the conformal coating or in-cup geometries, the remote phosphor structure gives the highest luminous efficacy. However, in terms of color quality, its performance is not as good as the others. The red-light compensation has been reported as the effective solution for enhancing the color quality of WLEDs. Hence, this study adopted the idea and applied to the dual-layer phosphor structure. The phosphor used to boost the red color in light formation is (Y,Gd)BO3:Eu particle. The dual-layer remote phosphor structure was simulated with the red (Y,Gd)BO3:Eu phosphor layer above the original yellow phosphor YAG:Ce3+ one. The WLEDs with different correlated color temperatures of 5600 K, 6600 K and 7700K were experimented. Mie-theory and Lambert-Beer law were applied to examine the results. The growth in color rendering index (CRI) and color quality scale (CQS) with the increase of (Y,Gd)BO3:Eu phosphor concentration was observed. Nevertheless, the lumen efficacy would be degraded if the concentration was over a certain number. The information provided in this article is useful for the development of high-power WLED production with greater color quality.

scholarly journals A 4.7-inch-Diagonal TFEL Display with SrS:Ce, Eu White Light Emitting Phosphor Layer.

1993 ◽  
Vol 47 (5) ◽  
pp. 702-707
Author(s):  
Yoshito Tanaka ◽  
Sadae Yamada ◽  
Maki Minamoto ◽  
Yuji Fujita ◽  
Tsuneo Konishi
Keyword(s):  
White Light ◽  
Phosphor Layer ◽  
Light Emitting

Cylindrical Tuber Encapsulant Layer Realization by Patterned Surface for Chip-on-Board Light-Emitting Diodes Packaging

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Xingjian Yu ◽  
Run Hu ◽  
Ruikang Wu ◽  
Bin Xie ◽  
Xiaoyu Zhang ◽  
...  
Keyword(s):  
Blue Light ◽  
White Light ◽  
Light Emitting Diodes ◽  
Composite Layer ◽  
Color Temperature ◽  
Efficiency Enhancement ◽  
Phosphor Layer ◽  
Light Emitting ◽  
Nanosilica Particles ◽  
Light Efficiency

In this study, we realized a cylindrical tuber silicone layer for improving the light efficiency of chip-on-board light-emitting diodes (COB-LEDs) by fabricating patterned LED substrate with both silicone-wetting and silicone-repellency surfaces. To realize silicone-repellency surface, low surface energy modified nanosilica particles were prepared and deposited on the LED substrate to form porous hierarchical structure. Light efficiency enhancement for blue light COB-LEDs with pure cylindrical tuber silicone layer and white light COB-LEDs with phosphor–silicone composite layer was studied. The results show that for blue light COB-LEDs with pure cylindrical tuber silicone layer, the light efficiency increases with the contact angle and a highest light efficiency enhancement of 62.6% was achieved at 90 deg when compared to the flat silicone layer. For white light COB-LEDs at correlated color temperature (CCT) of ∼5500 K, the cylindrical tuber silicone layer enhances the light efficiency by 13.6% when compared to the conventional flat phosphor layer.

White light-emitting organic electroluminescent device based on a new orange organometallic iridium complexes

2007 ◽  
Author(s):  
Tien-shou Shieh ◽  
Heh-lung Huang ◽  
Pey-ching Liu ◽  
Mei-Rurng Tseng ◽  
Jia-Ming Liu
Keyword(s):  
White Light ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Electroluminescent Device ◽  
Organic Electroluminescent

White-light emitting thin-film electroluminescent device using micromachined structure

1997 ◽  
Vol 44 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Yun-Hi Lee ◽  
Byeong-Kwon Ju ◽  
Man-Ho Song ◽  
Dong-Ho Kim ◽  
Taek-Sang Hahn ◽  
...  
Keyword(s):  
Thin Film ◽  
White Light ◽  
Light Emitting ◽  
Electroluminescent Device
Sign in / Sign up

Export Citation Format

Share Document