White polymer light-emitting diodes with ultra-large color shifts for pulse-width-modulation applications

2019 ◽  
Vol 7 (34) ◽  
pp. 10567-10573 ◽  
Author(s):  
Jiaxin Zhang ◽  
Feng Peng ◽  
Zhiming Zhong ◽  
Lei Ying ◽  
Yong Cao
Keyword(s):  
White Light ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Practical Applications ◽  
Polymer Light Emitting Diodes ◽  
Cie Coordinates ◽  
White Light Emitting Diodes

By using a commercially available pulse-width-modulation driver, the white light emitting diodes with independently tunable CIE coordinates and luminance were realized, which exhibited great potential toward practical applications.

scholarly journals Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Saroj Thapa ◽  
Gopi Chandra Adhikari ◽  
Hongyang Zhu ◽  
Alexei Grigoriev ◽  
Peifen Zhu
Keyword(s):  
Optical Properties ◽  
White Light ◽  
Light Emitting Diodes ◽  
Transition Metal Ions ◽  
Color Temperature ◽  
Lattice Contraction ◽  
Light Emitting ◽  
Practical Applications ◽  
Halide Perovskite ◽  
White Light Emitting Diodes

AbstractRecently, lead halide perovskite nanocrystals (NCs) have gained tremendous attention in optoelectronic devices due to their excellent optical properties. However, the toxicity of lead limits their practical applications. Here, the synthesis of Zn2+-alloyed CsZnxPb1-xX3 (up to 15%) NCs is reported to achieve lead-reduced white light-emitting diodes (WLEDs). The incorporation of Zn2+ into CsPbX3 host NCs results in a lattice contraction, without altering the structure and morphology, which has a direct effect on the optical properties. The blue-shifts in the photoluminescence emission and increase in bandgap is observed while retaining high photoluminescence quantum yield. Then by engineering the different compositions of halides for 15% Zn2+-alloyed CsZnxPb1-xX3 NCs, tunable emission (411–636 nm) is obtained. Notably, the WLEDs are experimentally demonstrated employing the lead-reduced NCs (blue, green, yellow, and red). By varying the ratios of the amount of NCs, white lights with a tunable correlated-color temperature (2218–8335 K), an exemplary color-rendering index (up to 93) and high luminous efficacy of radiation (268–318 lm·W−1) are obtained. Best of our knowledge, these are superior to other reported WLEDs based on CsPbX3 NCs doped with transition metal ions. This work places the halide perovskite NCs one-step closer in designing the environmentally benign and energy-efficient WLEDs.

Enhanced Cyan Emission and Optical Tuning of Ca 3 Ga 4 O 9 :Bi 3+ for High‐Quality Full‐Spectrum White Light‐Emitting Diodes

2020 ◽  
Vol 8 (22) ◽  
pp. 2001037 ◽  
Author(s):  
Dongjie Liu ◽  
Xiaohan Yun ◽  
Guogang Li ◽  
Peipei Dang ◽  
Maxim S. Molokeev ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
High Quality ◽  
Full Spectrum ◽  
Light Emitting ◽  
White Light Emitting Diodes

Glass-ceramic composites for high-power white-light-emitting diodes

2021 ◽  
Author(s):  
Alessandro Longato ◽  
Sebastiano Picco ◽  
Lorenzo Moro ◽  
Matteo Buffolo ◽  
Carlo De Santi ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Glass Ceramic ◽  
Light Emitting Diodes ◽  
Ceramic Composites ◽  
Light Emitting ◽  
White Light Emitting Diodes
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