Pressure‐Triggered Blue Emission of Zero‐Dimensional Organic Bismuth Bromide Perovskite. Issue 9 (15th February 2021)

• Record Type: Journal Article
• Authors: Sun, Meng‐En; Geng, Ting; Yong, Xue; Lu, Siyu; Ai, Lin; Xiao, Guanjun; Cai, Jinmeng; Zou, Bo; Zang, Shuang‐Quan
• Is Part Of: Advanced science. Volume 8:Issue 9(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-02-15
• Subjects: blue luminescence -- diamond anvil cell -- high pressure -- pressure‐induced emission -- zero‐dimensional perovskites; Science -- Periodicals; 505
• DOI: 10.1002/advs.202004853
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Understanding the structure–property relationships in Zero‐dimensional (0D) organic–inorganic metal halide perovskites (OMHP s) is essential for their use in optoelectronic applications. Moreover, increasing the emission intensity, particularly for blue emission, is considerably a challenge. Here, intriguing pressure‐induced emission (PIE ) is successfully achieved from an initially nonluminous 0D OMHP [(C6 H11 NH3 )4 BiBr6 ]Br·CH3 CN (Cy4 BiBr7 ) upon compression. The emission intensity increases significantly, even reaching high‐efficiency blue luminescence, as the external pressure is increased to 4.9 GPa. Analyses of the in situ high‐pressure experiments and first‐principle calculations indicate that the observed PIE can be attributed to the enhanced exciton binding energy associated with [BiBr6 ] 3– octahedron distortion under pressure. This study of Cy4 BiBr7 sheds light on the relationship between the structure and optical properties of OMHP s. The results may improve potential applications of such materials in the fields of pressure sensing and trademark security. Abstract : The deformation of bismuth bromide octahedra stimulated by lattice shrinkage enhances exciton–phonon coupling, resulting in bright blue emission at pressure of 4.9 GPa or low temperature for the Zero‐dimensional (0D) organic–inorganic metal halide perovskite [(C6 H11 NH3 )4 BiBr6 ]Br·CH3 CN (Cy4 BiBr7 ). This research provides a new research approach for the acquisition of the high efficiency blue emitting materials.