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Self‐Assembly of Perovskite Crystals Anchored Al 2 O 3 ‐La 2 O 3 Nanofibrous Membranes with Robust Flexibility and Luminescence
Author(s) -
Han Weidong,
Cui Fuhai,
Si Yang,
Mao Xue,
Ding Bin,
Kim Hakyong
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801963
Subject(s) - luminescence , membrane , photoluminescence , materials science , electrospinning , nanotechnology , crystal (programming language) , chemical engineering , optoelectronics , composite material , chemistry , polymer , computer science , biochemistry , programming language , engineering
Inorganic luminescent materials as one of the important high‐performance materials are widely used for industry and scientific research, mainly owing to their outstanding luminescence properties. However, inorganic luminescent materials are typically brittle and inelastic, which greatly limit their use in practical applications, particularly in flexible optoelectronic devices. In this work, it is shown that “plum‐pudding” like CsPbBr 3 /Cs 4 PbBr 6 perovskite crystals anchor onto Al 2 O 3 ‐La 2 O 3 (CCAL) nanofibrous membranes, which are synthesized via a facile electrospinning and subsequent supersaturated recrystallization process. The as‐synthesized CCAL membranes exhibit outstanding mechanical flexibility and luminescence properties. Meanwhile, the crystal structure and luminous performance of the CCAL membranes are regulated by different molar ratios of CsBr/PbBr 2 . The photoluminescence reaches a maximum value for the CCAL membranes produced with a CsBr/PbBr 2 ratio of 1, and shows a narrow emission line‐width of 18 nm. Furthermore, the potential applications of the CCAL nanofibrous membranes in green light devices through a remote nanofibrous membranes packaging approach are demonstrated. A pure green emission is achieved with the Commission Internationale de L'Eclairage color coordinates of (0.28, 0.65). This facile strategy would open a new avenue to flexible inorganic luminescent materials for the lighting and backlight display industries.