Glass-compatible and self-powered temperature alarm system by temperature-responsive organic manganese halides via backward energy transfer process

Abstract

The temperature alarm system is self-powered by luminescent solar concentrators based on a single green-emitted PEA 2 MnBr 2 I 2 with a backward energy transfer process. • The temperature alarm system self-powered by luminescent solar concentrators is proposed. • Organic manganese halides with backward energy transfer process is reported. • The PL intensity of OMHs can be increased by a factor of 4 as the temperature increases. • The luminescence layer of LSCs with the PLQY of 79% are prepared via in-situ blade coating. A pioneering glass-compatible transparent temperature alarm system self-powered by luminescent solar concentrators (LSCs) is reported. Single green-emitted organic manganese halides (OMHs) of PEA 2 MnBr 2 I 2 , which has a unique temperature-dependent backward energy transfer process from self-trapped state to 4 T 1 energy level of Mn, is used for triggering the temperature alarm. The LSC with red-emitted CsPbI 3 perovskite-polymer composite films on the glass substrate is used for power supply. The spectrally separated nature between the green-emitted OMHs for temperature alarm and red-emitted CsPbI 3 in LSC for power supply allows for probing the signal light of temperature-responsive OMHs without the interference of LSCs, making it possible to calibrate the temperature visually just by a self-powered brightness detection circuit with LED indicators. Taking advantage of LSC without hot spot effects plaguing the solar cells, as-prepared temperature alarm system can operate well on both sunny and cloudy day.