In situ fabrication of perovskite nanocrystals with Dion-Jacobson phase for high-performance blue light-emitting diodes

被引：3

作者：

Wang, Yang ^{[1
]}

Zhu, Xiaodong ^{[1
]}

Jia, Haoran ^{[2
]}

Xu, Donghui ^{[3
]}

Liu, Xiangyang ^{[3
]}

Bai, Yiming ^{[1
]}

Bian, Xingming ^{[1
]}

Wang, Fuzhi ^{[1
]}

Li, Meicheng ^{[1
]}

Tan, Zhan'ao ^{[2
]}

机构：

[1] North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewable, Sch New Energy, Baoding 102206, Peoples R China

[2] Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Beijing 100029, Peoples R China

[3] Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610068, Peoples R China

来源：

APPLIED PHYSICS REVIEWS | 2024年 / 11卷 / 03期

基金：

中国国家自然科学基金;

关键词：

EMISSION;

D O I：

10.1063/5.0200866

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Blue perovskite light-emitting diodes (PeLEDs) based on pure bromide compositions exhibit notable potential attributed to their stable performance and the absence of halogen phase separation. Nevertheless, a considerable challenge persists in the effective suppression of narrow-bandgap emission phases to ensure optimal color purity. In this investigation, we delve into the utilization of zwitterionic beta-alanine (beta-Ala) to facilitate the formation of nanocrystalline-structured perovskite. beta-Ala, possessing both amino and carboxyl groups, is an effective passivating agent for various defect sites on the perovskite's surface, exhibiting versatility through multiple binding modes. This irregular passivation pattern strategically hinders the perovskite from adopting a conventional quasi-2D layered structure. Through the strategic implementation of diamine ligands and CsBr to modulate the growth process, we successfully engineered quasi-2D perovskite nanocrystals with Dion-Jacobson phase (Q-2D PNCs) via an in situ coordination process. The application of the PNCs as emitters in blue PeLEDs yielded promising outcomes. The pure blue PeLED with electroluminescent peak at 473 nm achieves a maximum brightness and external quantum efficiency (EQE) of 8005 cd/m(2) and 8.91%, respectively. Additionally, PeLEDs with sky blue emission (479 nm) exhibited a maximum brightness and EQE of 9431 cd/m(2) and 10.02%, respectively.

引用

页数：12