Green Syntheses of Stable and Efficient Organic Dyes for Organic Hybrid Light-Emitting Diodes

2021 ◽  
Author(s):  
Yunping Huang ◽  
Theodore A Cohen ◽  
Parker Sommerville ◽  
Christine Luscombe
Keyword(s):  
Rare Earth ◽  
Light Emitting Diodes ◽  
Organic Dyes ◽  
Light Emitting ◽  
Organic Hybrid

Organic hybrid light-emitting diodes (hybrid-LEDs) employ organic dyes as light converters on top of commercial blue inorganic LEDs, replacing incumbent inorganic phosphor light converters synthesized from rare-earth and/or toxic metallic...

Rare Earth Nanophosphors in Light-Emitting Diodes

2012 ◽  
pp. 203-244 ◽  
Author(s):  
Chin Tee ◽  
Gautom Das ◽  
Yan Zhang ◽  
Timothy Tan
Keyword(s):  
Rare Earth ◽  
Light Emitting Diodes ◽  
Light Emitting

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>

Enhanced luminescence of Mn4+:Y3Al5O12red phosphor via impurity doping

2016 ◽  
Vol 4 (8) ◽  
pp. 1704-1712 ◽  
Author(s):  
Daqin Chen ◽  
Yang Zhou ◽  
Wei Xu ◽  
Jiasong Zhong ◽  
Zhenguo Ji ◽  
...  
Keyword(s):  
Rare Earth ◽  
White Light ◽  
Light Emitting Diodes ◽  
Glass Ceramics ◽  
Red Phosphor ◽  
Light Emitting ◽  
Impurity Doping ◽  
Enhanced Luminescence ◽  
White Light Emitting Diodes ◽  
Rare Earth Doped

A non-rare-earth doped Mn4+:Y3Al5O12red phosphor and the related glass–ceramics were fabricated to explore their application in white light-emitting diodes.

An efficient rare-earth free deep red emitting phosphor for improving the color rendering of white light-emitting diodes

2017 ◽  
Vol 5 (11) ◽  
pp. 2927-2935 ◽  
Author(s):  
Sisi Liang ◽  
Mengmeng Shang ◽  
Hongzhou Lian ◽  
Kai Li ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
White Light ◽  
Light Emitting Diodes ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
Light Emitting ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Red Emitting Phosphor

The Mn4+doped Mg14Ge5O24phosphor produces deep red emission, and the structure, photoluminescence properties, thermal stability and the performance of fabricated WLED are all investigated.

Energy Migration Engineering of Bright Rare-Earth Upconversion Nanoparticles for Excitation by Light-Emitting Diodes

2015 ◽  
Vol 27 (41) ◽  
pp. 6418-6422 ◽  
Author(s):  
Yeteng Zhong ◽  
Iman Rostami ◽  
Zihua Wang ◽  
Hongjie Dai ◽  
Zhiyuan Hu
Keyword(s):  
Rare Earth ◽  
Light Emitting Diodes ◽  
Energy Migration ◽  
Upconversion Nanoparticles ◽  
Light Emitting

Inorganic–organic hybrid white light phosphors

2016 ◽  
Vol 52 (90) ◽  
pp. 13194-13204 ◽  
Author(s):  
Ming-Sheng Wang ◽  
Guo-Cong Guo
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Feature Article ◽  
Light Emitting ◽  
Organic Hybrid ◽  
Organic Light

This feature article reviews the development of inorganic–organic hybrid white-light phosphors for the applications on light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs).

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