Author(s): Chen, D (Chen, Dan); Liu, TR (Liu, Taoran); Zuo, YH (Zuo, Yuhua); Li, CB (Li, Chuanbo); Zheng, J (Zheng, Jun); Liu, Z (Liu, Zhi); Liu, BY (Liu, Baoyu); Cheng, BW (Cheng, Buwen)

Source: TSINGHUA SCIENCE AND TECHNOLOGY Volume: 28 Issue: 1 Pages: 131-140 DOI: 10.26599/TST.2021.9010031 Published: FEB 2023

Abstract: Green Perovskite Light-Emitting Diodes (PeLEDs) have attracted wide attention for full spectrum displays. However, the inferior film morphology and luminescence property of quasi-two-dimensional (quasi-2D) perovskite layers limit the photoelectric property of the PeLEDs. In this paper, the effect of strontium (Sr) doped in quasi-2D perovskite layers is investigated to obtain a high-quality active layer. The morphologies and optical properties of Sr-doped quasi-2D perovskite films with different concentrations are studied. With the addition of strontium, more low-dimensional-layer perovskite phases (n = 2 and n = 3) appear in quasi-2D perovskite films, providing efficient intraband carrier funneling pathway and facilitating radiative recombination. The photoluminescence (PL) peak intensity of optimized Sr-doped quasi-2D perovskite layers increases 50% compared with the non-strontium counterpart. Moreover, green PeLEDs based on a Sr-doped quasi-2D perovskite layer reach a maximum luminance (L-max) of 2943.77 cd/m(2), which is three times of the control device. The electroluminescence (EL) peaks of Maximum External Quantum Efficiency (MEQE) and L-max of Sr-doped PeLEDs exhibite a slight shift, indicating the excellent stability and performance of Sr-doped devices. The optimized device can continuously operate for 360 s at MEQE driving voltage, resulting in a half-lifetime of similar to 60 s, which is 3-fold greater than that of the control PeLEDs.

Accession Number: WOS:000830013900012

ISSN: 1007-0214

eISSN: 1878-7606

Full Text: https://ieeexplore.ieee.org/document/9837008/