- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
ZnSe:Te/ZnSeS/ZnS Nanocrystals: An Access to Cadmium-Free Pure-Blue Quantum-Dot Light-Emitting Diodes
摘要： Cadmium-free quantum dots (QDs) are attracting considerable research attention because of their low toxicity. However, the bandgap of most cadmium-free QDs avoids the pure-blue region, which confers difficulty in realizing pure-blue quantum-dot light-emitting diodes (QLEDs). In this work, we successfully tuned the emission wavelength of ZnSe/ZnS quantum dots from the violet region (~ 420 nm) to the pure-blue region (450 – 460 nm) by doping Te into the ZnSe core. The ZnSe:0.03Te/ZnSeS/ZnS QDs sample with an emission position of 450 nm and quantum yield of 30% was the most balanced formula. To overcome the energy gap between the hole-transfer layer and QD layers, a specific hole-transfer layer was developed for normal-structure QLEDs. Such structure QLED by ZnSe:0.03Te/ZnSeS/ZnS QDs achieved the pure-blue light emission at 455 nm, a low turn-on voltage of 4.4 V, and external quantum efficiency of 0.33%. Overall, our cadmium-free QLED achieved pure-blue emission, revealing the potential of ZnSe-based pure-blue QLEDs for future displays.
关键词： Pure-blue emission,Cadmium-free,QLEDs,Quantum dots,ZnSe
更新于2025-09-23 15:21:01
-
Calcium-tributylphosphine oxide passivation enables the efficiency of pure-blue perovskite light-emitting diode up to 3.3%
摘要： Metal halide perovskites are attractive for light-emitting diodes due to their superior optoelectronic properties such as tunable bandgaps, high photoluminescence quantum yields (PLQYs), high color purities and solution processability. In the past several years, impressive progress has been made in perovskite light-emitting diodes (PeLEDs) via microstructure engineering, charge balancing, surface defect passivation, metal ion doping and dimensional engineering. As such, the green, red and near-infrared PeLEDs have achieved impressive external quantum efficiencies (EQEs) exceeding 20%. However, the performances of pure-blue PeLEDs, i.e., brightness and EQEs, still lag largely behind those of the green and red counterparts, which severely impedes the PeLED application in full-color display and solid-state lighting.
关键词： passivation,pure-blue,perovskite,calcium-tributylphosphine oxide,light-emitting diode
更新于2025-09-23 15:21:01