Synthesis and Structure Design of I-III-VI Quantum Dots for White Light-emitting Diodes

Author(s):  
Hanxu Lu ◽  
Zhe Hu ◽  
WenJie Zhou ◽  
JinXin Wei ◽  
Wanlu Zhang ◽  
...  

Quantum-dot-based light-emitting diodes (LEDs) have been considered as promising alternatives to the traditional light sources due to their photo- and thermal-stability, emission wavelength tunability, and so forth. From the past...

2017 ◽  
Vol 29 (37) ◽  
pp. 1702910 ◽  
Author(s):  
Zifei Wang ◽  
Fanglong Yuan ◽  
Xiaohong Li ◽  
Yunchao Li ◽  
Haizheng Zhong ◽  
...  

2021 ◽  
Vol 10 (1) ◽  
pp. 465-477
Author(s):  
Longshi Rao ◽  
Qing Zhang ◽  
Mingfu Wen ◽  
Zhongfa Mao ◽  
Huaxian Wei ◽  
...  

Abstract White light-emitting diodes (WLEDs) hold great promise in lighting, display, and visible light communication devices, and single-component white emission carbon quantum dots (SCWE-CQDs) as the key component of WLEDs have many outstanding advantages. However, rapid and efficient synthesis of SCWE-CQDs with high photoluminescence quantum yield (PLQY) and stability remains challenging. Here, we report a novel solvent engineering strategy to obtain highly photoluminescent SCWE-CQDs by controlling the dilution ratios between N,N-dimethylformamide (DMF) and pristine red carbon quantum dots (RCQDs) solution. By optimizing synthesis conditions, the relative PLQY of the SCWE-CQDs solution reached 53%. Morphological, structural, and optical property characterizations indicate that the combined action of the hydrogen bond (HB) effect and the size effect leads to the blue shift of RCQDs, but the HB effect is more dominant than the particle size in causing large spectral shifts. In addition, the WLEDs with high color rendering index of 89 and remarkable reliability were obtained based on the highly photoluminescent SCWE-CQDs. This facile solvent engineering approach for synthesizing tunable emission CQDs will promote the progress of carbon-based luminescent materials for applications in optoelectronic devices.


2019 ◽  
Vol 669 ◽  
pp. 34-41 ◽  
Author(s):  
Zhiwei He ◽  
Congbiao Jiang ◽  
Chen Song ◽  
Juanhong Wang ◽  
Zhenji Zhong ◽  
...  

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