Harvesting Cool Daylight in Hybrid Organic–Inorganic Halides Microtubules through the Reservation of Pressure‐Induced Emission

Abstract

Pressure‐induced emission (PIE) is extensively studied in halide perovskites or derivative hybrid halides. However, owing to the soft inorganic lattice of these materials, the intense emission is barely retained under ambient conditions, thus largely limiting their practical applications in optoelectronics at atmospheric pressure. Here, remarkably enhanced emission in microtubules of the 0D hybrid halide (C5H7N2)2ZnBr4 ((4AMP)2ZnBr4) is successfully achieved by means of pressure treatment at room temperature. Notably, the emission, which is over ten times more intense than the emission in the initial state, is retained under ambient conditions upon the complete release of pressure. Furthermore, the pressure processing enables the tuning of “sky blue light” before compression to “cool daylight” with a remarkable quantum yield of 88.52% after decompression, which is of considerable interest for applications in next‐generation lighting and displays. The irreversible electronic structural transition, induced by the steric hindrance with respect to complexly configurational organic molecules [4AMP], is highly responsible for the eventual retention of PIE and tuning of the color temperature. The findings represent a significant step toward the capture of PIE under ambient conditions, thus facilitating its potential solid‐state lighting applications.

Self-trapped exciton emission and piezochromism in conventional 3D lead bromide perovskite nanocrystals under high pressure

“…Its excited carriers within the host perovskite excitation are trapped into Mn 2+ , leading to the formation of local electrons via energy transfer. 27–30 Doping Mn 2+ in CsPbBr 3 induces the local distortion of the octahedral framework considerably, in contrast to the case of CsPbCl 3 NCs. 31 This phenomenon occurs because of the greater disparity of M–Br (M = Pb, Mn) bond-dissociation energies between PbBr 2 (249 kJ mol −1 ) and MnBr 2 (314 kJ mol −1 ) compared with PbCl 2 (301 kJ mol −1 ) and MnCl 2 (338 kJ mol −1 ) precursors.…”

Emission Mechanism of Self-Trapped Excitons in Sb3+-Doped All-Inorganic Metal-Halide Perovskites

“…Single-source phosphors with broad emission spanning the entire visible spectrum (400–800 nm) are suitable candidates for continuous white-light sources in solid-state lighting applications, which can simplify the device structure and eliminate the self-absorption and color-instability problems observed in multi-emitters. − Metal-halide perovskites and their derivatives have recently been shown to be promising single materials for efficient broadband emission. − The general chemical formula of metal-halide perovskite derivatives is A m BX n , where A is a monovalent cation, B is a monovalent to tetravalent cation, and X is a halide anion. The optical bandgap of metal halides is mainly determined by the B-site metal-halide polyhedron. , The origin of the broadband emission in metal halides is still under debate, and it is of great interest to reveal the origin mechanism and obtain an in-depth understanding of broadband emission from metal halides.…”

Pressure-Induced Abnormal Electrical Transport Transition from Pure Electronic to Mixed Ionic–Electronic in Multiferroic BiFeO3 Ceramics

“…High pressure, as an important thermodynamic parameter and extreme condition, is a useful tool for tuning the crystal and electronic structures of materials without introducing other chemical compositions . Under ambient conditions, BFO crystallizes in the rhombohedral R 3 c space group (Figure S1).…”

“…High pressure, as an important thermodynamic parameter and extreme condition, is a useful tool for tuning the crystal and electronic structures of materials without introducing other chemical compositions. 19 Under ambient conditions, BFO crystallizes in the rhombohedral R3c space group (Figure S1). It undergoes a series of phase transitions under high pressure, including R3c−Pbam−Cmmm−Pnma, and exhibits numerous novel and unexpected phenomena.…”