Details

Autor(en) / Beteiligte

• Liu, Zhenyang
• Sun, Yingying
• Cai, Tong
• Yang, Hanjun
• Zhao, JinXing
• Yin, Tao
• Hao, Chaoqi
• Chen, Mingjun
• Shi, Wenwu
• Li, Xiaoxiao
• Guan, Li
• Li, Xu
• Wang, Xinzhong
• Tang, Aiwei
• Chen, Ou

Titel

Two‐Dimensional Cs2AgInxBi1‐xCl6 Alloyed Double Perovskite Nanoplatelets for Solution‐Processed Light‐Emitting Diodes

Ist Teil von

• Advanced materials (Weinheim), 2023-05, Vol.35 (19), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Lead‐free double perovskites have emerged as a promising class of materials with potential to be integrated into a wide range of optical and optoelectronic applications. Herein, the first synthesis of 2D Cs2AgInxBi1‐xCl6 (0 ≤ x ≤ 1) alloyed double perovskite nanoplatelets (NPLs) with well controlled morphology and composition is demonstrated. The obtained NPLs show unique optical properties with the highest photoluminescence quantum yield of 40.1%. Both temperature dependent spectroscopic studies and density functional theory calculation results reveal that the morphological dimension reduction and In–Bi alloying effect together boost the radiative pathway of the self‐trapped excitons of the alloyed double perovskite NPLs. Moreover, the NPLs exhibit good stability under ambient conditions and against polar solvents, which is ideal for all solution‐processing of the materials in low‐cost device manufacturing. The first solution‐processed light‐emitting diodes is demonstrated using the Cs2AgIn0.9Bi0.1Cl6 alloyed double perovskite NPLs as the sole emitting component, showing luminance maximum of 58 cd m−2 and peak current efficiency of 0.013 cd A−1. This study sheds light on morphological control and composition‐property relationships of double perovskite nanocrystals, paving the way toward ultimate utilizations of lead‐free perovskite materials in diverse sets of real‐life applications. 2D Cs2AgInxBi1‐xCl6 (0 ≤ x ≤ 1) alloyed double perovskite nanoplatelets are synthesized. The outstanding optical properties can be well explained by temperature‐dependent photoluminescence spectroscopy study and first‐principal density functional theory calculations. The as‐prepared alloyed double perovskite nanoplatelets exhibit unprecedent stability toward air and polar solvents. All‐solution‐processed light‐emitting diodes using this material as the sole emitting layer are successfully fabricated.