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Development of highly efficient blue-emitting ZnSexTe1-x/ZnSe/ZnS quantum dots and their electroluminescence application
Journal of Industrial and Engineering Chemistry ( IF 5.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jiec.2020.05.003
Soowung Park , Chaeyeon Son , Seokwoo Kang , Seungmin Baek , Yongjin Kim , O-Pil Kwon , Jongwook Park , Sang-Wook Kim

Abstract Highly efficient blue-emitting halide-passivated QDs with the emission of 445−450 nm were developed. First, we prepared large ZnSe QDs and evaluated their wavelength, but 440 nm was the upper limit. Then, ZnSe1-xTex QDs were synthesized, and thus 410 nm emission was achieved. To improve the quantum yield (QY) and obtain a red-shifted wavelength, repeated ZnSe shell coating, ZnS coating, and halide passivation were conducted. The optimum were ZnSe1-xTex/ZnSe/ZnS QDs with 5% or 2% Te. The final QDs with 5% Te have a higher QY of 81% and the performance of the deep-blue QLEDs (turn-on voltage: 5.13 V, maximum luminance: 3200 cd/m2, maximum current efficiency: 2.73 cd/A, and maximum EQE: 4.06%, CIE: (0.151, 0.056)); however, a long emission tail due to the surface trap will hinder practical application. The QDs with 2% Te have a good emission profile and FWHM of 16 nm, but their QY is slightly lower.

中文翻译:

高效蓝光ZnSexTe1-x/ZnSe/ZnS量子点的开发及其电致发光应用

摘要 开发了发射波长为 445-450 nm 的高效蓝光卤化物钝化 QD。首先,我们制备了大型 ZnSe QD 并评估了它们的波长,但 440 nm 是上限。然后,合成了 ZnSe1-xTex 量子点,从而实现了 410 nm 的发射。为了提高量子产率 (QY) 并获得红移波长,进行了重复的 ZnSe 壳涂层、ZnS 涂层和卤化物钝化。最佳的是 ZnSe1-xTex/ZnSe/ZnS QDs,含 5% 或 2% Te。具有 5% Te 的最终 QD 具有更高的 81% 的 QY 和深蓝色 QLED 的性能(开启电压:5.13 V,最大亮度:3200 cd/m2,最大电流效率:2.73 cd/A,以及最大 EQE:4.06%,CIE:(0.151, 0.056));然而,由于表面陷阱导致的长发射尾会阻碍实际应用。
更新日期:2020-08-01
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