Tunable Color Temperatures and Emission Enhancement in 1D Halide Perovskites under High Pressure. Issue 18 (26th June 2020)

• Record Type: Journal Article
• Authors: Ma, Zhiwei; Li, Fangfang; Sui, Laizhi; Shi, Yue; Fu, Ruijing; Yuan, Kaijun; Xiao, Guanjun; Zou, Bo
• Is Part Of: Advanced optical materials. Volume 8:Issue 18(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-26
• Subjects: diamond anvil cell -- emission enhancement -- halide perovskites -- high pressure -- octahedral distortions; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202000713
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Designing low‐dimensional halide perovskites (LDHPs) for broadband emissions with enhanced emission and preferred chromaticity coordinator or color temperature remains a pressing challenge. Herein, a comprehensive study is conducted about the relationship between the crystal structure and broadband emission properties of 1D halide perovskite C4 N2 H14 PbBr4, one of promising white‐emission LDHPs. It is found that the zigzag distortion degree tuned by pressure not only suppresses the general photoluminescence quenching, but also effectively adjusts the chromaticity coordinator and color temperature of C4 N2 H14 PbBr4 nanocrystals (NCs). The initially broad white emissive C4 N2 H14 PbBr4 NCs can be continuously modulated to a very bright bluish‐white emission with high color‐rendering index of 86, accompanied by a significant emission enhancement. The underlying mechanism of thus pressure‐induced emission enhancement (PIEE) can be attributed to the strengthening of electron–phonon interactions of compressed C4 N2 H14 PbBr4 NCs. Furthermore, the zigzag distortion of [PbBr4 2− ]∞ octahedral chains is able to rearrange the depths of multiple self‐trapped states, which is also corroborated by the wavelength‐dependent decay times under pressure, ultimately giving rise to adjustable emission chromaticity. This study offers a deep insight into the relationship between PIEE and distortion degree of LDHPs at extremes and facilitates the design of new materials with the desired emission properties. Abstract : The tunable color temperatures and enhanced emission are achieved by modulating the zigzag distorted degree of [PbBr4 2− ]∞ octahedral chains in 1D halide perovskites. The detail analysis about the relationship between the crystal structure and broad emission properties indicates that the distorted [PbBr4 2− ]∞ octahedral chains not only improve the electron–phonon interactions, but also rearrange the depths of multiple self‐trapped states.