scholarly journals Polarized white light from LEDs using remote-phosphor layer sandwiched between reflective polarizer and light-recycling dichroic filter

2013 ◽  
Vol 21 (S5) ◽  
pp. A765 ◽  
Author(s):  
Ji Hye Oh ◽  
Su Ji Yang ◽  
Young Rag Do
Keyword(s):  
White Light ◽  
Phosphor Layer ◽  
Remote Phosphor ◽  
Dichroic Filter

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 Improving the optical efficiency of white light-emitting diodes based on phosphor-in-glass by a dual-layer remote phosphorus structure with the application of LiLaO2:Eu3+ and CaSO4:Ce3+, Mn2+

2021 ◽  
Vol 10 (4) ◽  
pp. 1838-1845
Author(s):  
Phan Xuan Le ◽  
Le Tien
Keyword(s):  
White Light ◽  
Mie Scattering ◽  
Luminous Flux ◽  
Color Temperature ◽  
Phosphor Layer ◽  
Green Phosphor ◽  
Optical Efficiency ◽  
Color Quality ◽  
Color Uniformity ◽  
Remote Phosphor

While the remote phosphor structure is not an appropriate solution for WLED color uniformity, it is more advantageous for the luminous output of WLED than the conformal phosphor or in-cup phosphor structure. Acknowledging the ability of the remote phosphor structure, many studies have been carried out to surmount the color quality disadvantage of this structure. A dual-layer remote phosphor configuration is proposed in this research paper to acquire better color quality for WLEDs through heightening the color rendering index (CRI) and the color quality scale (CQS). The color temperature of the WLED packages this study is 8500 K. By inserting a layer of green CaSO4:Ce3+,Mn2+ or red LiLaO2:Eu3+ phosphor on the yellow YAG:Ce3+ phosphor layer, the phosphor structure configuration can be constructed. Then, to get the best color quality, the concentration of added phosphor LiLaO2:Eu3+ would be changed. The findings showed the rise of CRI and CQS along with the LiLaO2:Eu3+, which implies the influence of LiLaO2:Eu3+ to the growth of red light components within WLEDs packages. The greater the concentration of LiLaO2:Eu3+ is, the more the CRI and CQS increase. Meanwhile, the luminous flux gains from the green phosphor CaSO4:Ce3+,Mn2+. Nevertheless, the luminous flux and color quality would decrease if the concentrations of both red LiLaO2:Eu3+ and green CaSO4:Ce3+,Mn2+ phosphors reach a certain corresponding level. Centered on the Mie-scattering theory and the law of Lambert-Beer, this result is illustrated. The findings in this research are vital references for manufacturing WLEDs with higher white light performance.

scholarly journals 4-Gbit/s visible light communication link based on 16-QAM OFDM transmission over remote phosphor-film converted white light by using blue laser diode

2015 ◽  
Vol 23 (26) ◽  
pp. 33656 ◽  
Author(s):  
José Ramón Durán Retamal ◽  
Hassan Makine Oubei ◽  
Bilal Janjua ◽  
Yu-Chieh Chi ◽  
Huai-Yung Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Laser Diode ◽  
White Light ◽  
Visible Light Communication ◽  
Blue Laser ◽  
Communication Link ◽  
Blue Laser Diode ◽  
Remote Phosphor ◽  
Phosphor Film

High Thermal Stability and Wide Angle of White Light Chip-on-Board Package Using a Remote Phosphor Structure

2015 ◽  
Vol 36 (3) ◽  
pp. 250-252 ◽  
Author(s):  
Pai-Yang Tsai ◽  
Hou-Kuei Huang ◽  
Jian-Min Sung ◽  
Ming-Chi Kan ◽  
Yeong-Her Wang
Keyword(s):  
Thermal Stability ◽  
White Light ◽  
High Thermal Stability ◽  
Wide Angle ◽  
Remote Phosphor

scholarly journals Trapped whispering-gallery optical modes in white light-emitting diode lamps with remote phosphor

2006 ◽  
Vol 89 (4) ◽  
pp. 041125 ◽  
Author(s):  
Hong Luo ◽  
Jong Kyu Kim ◽  
Yangang Andrew Xi ◽  
E. Fred Schubert ◽  
Jaehee Cho ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Whispering Gallery ◽  
Remote Phosphor ◽  
Optical Modes

Thermal Simulation for High Power LED Systems with Remote Phosphor Layer

2018 ◽  
Author(s):  
Minshu Zhang ◽  
An Xie ◽  
Jeffery C. C. Lo ◽  
S. W. Ricky Lee ◽  
Madina. Ahmatjan ◽  
...  
Keyword(s):  
High Power ◽  
Thermal Simulation ◽  
Phosphor Layer ◽  
Remote Phosphor ◽  
High Power Led

Enhancement Spatial Color Uniformity of White Light LED Lamps by Adding Silicon Dioxides in Phosphor Layer

2016 ◽  
Vol 9 (5) ◽  
pp. 121-130
Author(s):  
Nguyen Doan Quoc Anh ◽  
Tran Hoang Quang Minh ◽  
Nguyen Huu ◽  
Khanh Nhan
Keyword(s):  
White Light ◽  
Phosphor Layer ◽  
Color Uniformity

Analysis of high-power packages for white-light-emitting diode lamps with remote phosphor

2005 ◽  
Vol 892 ◽  
Author(s):  
Hong Luo ◽  
Jong Kyu Kim ◽  
Yangang Xi ◽  
E. Fred Schubert ◽  
Jaehee Cho ◽  
...  
Keyword(s):  
Ray Tracing ◽  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Blue Phosphor ◽  
Remote Phosphor ◽  
Optical Modes ◽  
Diffuse Reflector

AbstractAn optimized packaging configuration for high-power white-light-emitting diode (LED) lamps that employs a diffuse reflector cup, a remote phosphor and a hemi-spherically-shaped encapsulation is presented. Ray tracing simulations for this configuration show that the phosphor efficiency can be enhanced by up to 50% over conventional packages. It is experimentally shown that dichromatic LED lamps with remote phosphor and diffuse reflector cup configuration have higher phosphor efficiency by 15.4% for blue-pumped yellow phosphor and by 27% for ultraviolet-pumped blue phosphor over conventional packages. Those improvements are attributed to reduced absorption of the phosphorescence by the LED chip and the reduction of deterministic optical modes trapped inside the encapsulant.

Sign in / Sign up

Export Citation Format

Share Document