Novel Yellow-Emitting Sr8MgLn(PO4)7:Eu2+(Ln = Y, La) Phosphors for Applications in White LEDs with Excellent Color Rendering Index

2011 ◽  
Vol 50 (12) ◽  
pp. 5725-5730 ◽  
Author(s):  
Chien-Hao Huang ◽  
Teng-Ming Chen
Keyword(s):  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering ◽  
Excellent Color

scholarly journals Photoluminescence tuning of Ca8−xSrxMgGd(PO4)7:Eu2+,yMn2+ phosphors for applications in white LEDs with excellent color rendering index

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19223-19230 ◽  
Author(s):  
Jiaqi Long ◽  
Yuzhen Wang ◽  
Chaoyang Ma ◽  
Xuanyi Yuan ◽  
Wenfeng Dong ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
White Leds ◽  
Color Rendering Index ◽  
Yellow Orange ◽  
Color Rendering ◽  
Excellent Color

Two series of novel phosphors of green-yellow emitting Ca8−xSrxMgGd(PO4)7:Eu2+ and yellow-orange emitting Sr8MgGd(PO4)7:Eu2+,yMn2+ were successfully synthesized by a solid-state reaction.

scholarly journals Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index

2021 ◽  
Author(s):  
Yunping Huang ◽  
Theodore A. Cohen ◽  
Christine K. Luscombe
Keyword(s):  
Excited State ◽  
Organic Dyes ◽  
Continuous Emission ◽  
Light Emitting ◽  
Organic Hybrid ◽  
Industry Standard ◽  
Color Rendering Index ◽  
The Cost ◽  
Color Rendering ◽  
Excellent Color

<p>Light-emitting diodes (LEDs) are a lighting technology with a huge and ascending market. Typically, LED backlights are often paired with inorganic phosphors made from rare-earth elements (REEs) to tune the emission lineshapes for different applications. However, REE production is a resource-intensive process with many negative environmental impacts. Herein we develop organic hybrid LEDs using organic dyes synthesized from an abundant and non-toxic natural product (theobromine) to replace REE phosphors. The resulting hybrid LED generates continuous emission from 400 – 740 nm, resulting in high color rendering index (the current industry standard) of 90 and color fidelity index (the most advanced and comprehensive standard) of 92, challenging commercial LEDs based on REE phosphors. In addition, the light-converting composite is made from 99 wt% SBS, an inexpensive industrial polymer, and 1wt% theobromine dyes, reducing the cost of the light converter to ¢1.30 for a 1 W LED, compared to approximately ¢ 19.2 of commercial products. The light converting efficiency of the dye-SBS composite is 82%. Excited state kinetics experiments were also conducted to provide guidance to further increase the light-converting efficiency of the theobromine dyes while maintaining excellent color rendering and fidelity. </p>

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from garnet-type Ca2YZr2(AlO4)3:Ce3+,Tb3+ phosphors for white LEDs with high color rendering index

2019 ◽  
Vol 7 (34) ◽  
pp. 10471-10480 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Leds ◽  
Highly Efficient ◽  
Color Rendering Index ◽  
Color Rendering

Highly efficient Ce3+ → Tb3+ energy transfer induced bright narrowband green emissions from Ca2YZr2(AlO4)3:Ce3+,Tb3+ garnet phosphors, which showed great potential for application in warm-white LEDs with high color rendering index.

Enhancing the Color Rendering Index for Phosphor‐converted White LEDs Using Cadmium‐Free CuInS2/ZnS QDs

2013 ◽  
Vol 60 (7) ◽  
pp. 801-806 ◽  
Author(s):  
Po‐Hsiang Chuang ◽  
Chun Che Lin ◽  
Heesun Yang ◽  
Ru‐Shi Liu
Keyword(s):  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering

Brownish red emitting YAG:Ce3+,Cu+ phosphors for enhancing the color rendering index of white LEDs

2012 ◽  
Vol 523 ◽  
pp. 151-154 ◽  
Author(s):  
Cong Zhao ◽  
Dachuan Zhu ◽  
Mingxing Ma ◽  
Tao Han ◽  
Mingjing Tu
Keyword(s):  
White Leds ◽  
Color Rendering Index ◽  
Color Rendering
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