Fluorescent nanomaterial-derived white light-emitting diodes: what's going on

2014 ◽  
Vol 2 (22) ◽  
pp. 4358-4373 ◽  
Author(s):  
Qiang Zhang ◽  
Cai-Feng Wang ◽  
Lu-Ting Ling ◽  
Su Chen
Keyword(s):  
White Light ◽  
Recent Progress ◽  
Light Emitting Diodes ◽  
Semiconductor Nanocrystals ◽  
Light Emitting ◽  
White Leds ◽  
White Light Emitting Diodes ◽  
Carbon Based

In this review, we highlight recent progress of fluorescent nanomaterial-derived white LEDs, including semiconductor nanocrystals or colloidal QD-based LEDs, carbon-based LEDs, silicon QD-based LEDs, and organic–inorganic fluorescent nanocomposite derived white LEDs.

scholarly journals White-light-emitting diodes using semiconductor nanocrystals

2007 ◽  
Vol 159 (3-4) ◽  
pp. 207-215 ◽  
Author(s):  
Yanqin Li ◽  
Aurora Rizzo ◽  
Roberto Cingolani ◽  
Giuseppe Gigli
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Semiconductor Nanocrystals ◽  
Light Emitting ◽  
White Light Emitting Diodes

Three-dimensional GaN dodecagonal ring structures for highly efficient phosphor-free warm white light-emitting diodes

Nanoscale ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 4686-4695 ◽  
Author(s):  
Young Chul Sim ◽  
Seung-Hyuk Lim ◽  
Yang-Seok Yoo ◽  
Min-Ho Jang ◽  
Sunghan Choi ◽  
...  
Keyword(s):  
White Light ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Three Dimensional ◽  
Light Emitting ◽  
White Leds ◽  
Highly Efficient ◽  
Warm White Light ◽  
Ring Structures ◽  
White Light Emitting Diodes

Multifaceted dodecagonal ring structures emit light of various colours with high efficiency and are demonstrated to be phosphor-free white LEDs.

Novel polygonal structure Mn4+ activated In3+-based Elpasolite-type hexafluorides red phosphor for warm white light-emitting diodes (WLEDs)

2019 ◽  
Vol 48 (4) ◽  
pp. 1376-1385 ◽  
Author(s):  
Feng Hong ◽  
Haiming Cheng ◽  
Chao Song ◽  
Guixia Liu ◽  
Wensheng Yu ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Synthetic Methods ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
Polygonal Structure ◽  
Warm White Light ◽  
White Light Emitting Diodes

Red phosphors (NH4)2NaInF6:Mn4+ with controllable morphology were synthesized via different synthetic methods, which can be fabricated for warm white LEDs.

Synthesis, structure and luminescence properties of new blue-green-emitting garnet-type Ca3Zr2SiGa2O12:Ce3+ phosphor for near-UV pumped white-LEDs

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2155-2161 ◽  
Author(s):  
Jiyou Zhong ◽  
Weidong Zhuang ◽  
Xianran Xing ◽  
Ronghui Liu ◽  
Yanfeng Li ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Luminescence Properties ◽  
Light Emitting ◽  
White Leds ◽  
White Light Emitting Diodes

A new blue-green-emitting garnet-type phosphor Ca3Zr2SiGa2O12:Ce3+ has been explored for n-UV pumped white light-emitting diodes.

scholarly journals White-light-emitting diodes using semiconductor nanocrystals

2008 ◽  
Vol 160 (3) ◽  
pp. 385-385
Author(s):  
Yanqin Li ◽  
Aurora Rizzo ◽  
Roberto Cingolani ◽  
Giuseppe Gigli
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Semiconductor Nanocrystals ◽  
Light Emitting ◽  
White Light Emitting Diodes

Eu2+-activated full color orthophosphate phosphors for warm white light-emitting diodes

RSC Advances ◽  
2014 ◽  
Vol 4 (62) ◽  
pp. 33114-33119 ◽  
Author(s):  
Chenglong Zhao ◽  
Zhiguo Xia ◽  
Molin Li
Keyword(s):  
White Light ◽  
Potential Application ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
White Leds ◽  
Full Color ◽  
Warm White Light ◽  
White Light Emitting Diodes

Eu2+-activated full-color versatile orthophosphate phosphors can find potential application in warm white LEDs.

Synthesis of narrow-band red-emitting K2SiF6:Mn4+ phosphors for a deep red monochromatic LED and ultrahigh color quality warm-white LEDs

2015 ◽  
Vol 3 (3) ◽  
pp. 607-615 ◽  
Author(s):  
Ji Hye Oh ◽  
Heejoon Kang ◽  
Yun Jae Eo ◽  
Hoo Keun Park ◽  
Young Rag Do
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Narrow Band ◽  
Light Emitting ◽  
White Leds ◽  
Color Quality ◽  
Warm White Light ◽  
White Light Emitting Diodes

In this study, we synthesized and characterized narrow-band red-emitting K2SiF6:Mn4+ phosphors in order to improve the color qualities of warm white light-emitting diodes (LEDs).

scholarly journals Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

2021 ◽  
Vol 10 (3) ◽  
pp. 1316-1324
Author(s):  
My Hanh Nguyen Thi ◽  
Phung Ton That
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Light Output ◽  
Sio2 Nanoparticles ◽  
Nano Particles ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
White Leds ◽  
White Light Emitting Diodes

In this research, the SiO2 nano-particles (NPs) usage in enhancing optical performances of InGaN/GaN-based white light-emitting diodes (WLEDs) with remote phosphor structure. The research subject shows better lighting capacity than the white LEDs devices without the space between the layers. The adjustment in development process resulted in enhancements of internal quantum efficiency (IQE) and light extraction efficiency (LEE) that lead to 13.5% luminous efficacy improvement. From the experiments, it can be concluded that the LEE is affected by the trapped light and enhancing the light output with SiO2 scattering properties reduce the amount of trapped light. These results confirm that SiO2 nano-particles is effective in enhancing the optical performance of WLEDs and can be considered for production of higher quality devices.

Phosphor Concentration Effects on Optothermal Characteristics of Phosphor Converted White Light-Emitting Diodes

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Jiun Pyng You ◽  
Yeong-Her Lin ◽  
Nguyen T. Tran ◽  
Frank G. Shi
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Pulse Current ◽  
Light Output ◽  
Constant Current ◽  
Concentration Effects ◽  
Light Emitting ◽  
White Leds ◽  
Physical Mechanisms ◽  
White Light Emitting Diodes

The thermal and optical characteristics of phosphor converted white light-emitting diodes (LEDs) with different phosphor concentrations ranging from 4 wt % to 13 wt % are investigated. The light output of LEDs with higher phosphor concentration is found to have larger degradation in constant current compared with pulse current than that with lower phosphor concentration. In addition, the junction temperatures of phosphor converted white LEDs raise with increasing phosphor concentration, so that the decreased phosphor conversion efficiency is observed both in pulse and constant current modes. The physical mechanisms for these observations are discussed. This study elucidates the phosphor dependent optical and thermal behavior of phosphor converted white LEDs.

Aggregation-induced emission assembled ultrathin films for white light-emitting diodes

2017 ◽  
Vol 53 (94) ◽  
pp. 12676-12679 ◽  
Author(s):  
Zekun Zhang ◽  
Rui Tian ◽  
Wenjuan Zhou ◽  
Yanjun Lin ◽  
Chao Lu
Keyword(s):  
White Light ◽  
Ultrathin Films ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
White Leds ◽  
White Light Emitting Diodes

White-light emitting ultrathin films have been achieved using aggregation-induced emission molecules, exhibiting excellent performances in white-LEDs.

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