Aggregation‐Induced Emission Features of Organometal Halide Perovskites and Their Fluorescence Probe Applications

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Abstract
Organometal hybrid perovskites exhibit tunable absorption and photoluminescence spectra that originate from the adjustable excitons of the self‐assembled quantum‐well structures. The aggregation‐induced emission (AIE) features of (RNH3)2PbI4 (R = alkyl, CnH2n+1, n = 4, 12, 16, 18) as well as their reversible photoluminescence response to pH value are demonstrated. This interesting phenomenon correlates with the formation of quantum‐well structure, which is a novel AIE mechanism. The temperature sensors based on organometal hybrid perovskites are also investigated. The combination of high sensitivity (1.3% K−1) and good reversibility (>500 cycles) of organometal halide perovskites to temperature in a large temperature range (0–80 °C) makes them to be versatile systems for the temperature sensor applications. Furthermore, as a proof of concept, the application of organometal hybrid perovskites in 2D spatial imaging and NIR light detection is also presented.

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