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Dual-Mode Optical Thermometry and Plant-Growth Lighting Enabled by Sb3+-Doped Organic-Metal Halide Thin Films
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DOI：10.1002/adom.71585.png)
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Abstract
En 中文
The integration of optical environmental sensing with plant photophysiological regulation into a single-material platform remains a key challenge for smart agriculture. Here, we report a flexible luminescent composite film based on Sb3+-doped (C18H15S)2InCl5 in a polydimethylsiloxane matrix, which combines optical thermometry and tailored plant-growth lighting. Multidimensional analyses using Raman spectroscopy and steady-state/time-resolved photoluminescence (PL) elucidate the key role of electron-phonon coupling in energy-level modulation and radiative transitions. The emission shows strong excitation-wavelength dependence. Under 360 nm excitation, the film exhibits a pronounced thermochromic shift from red (80 K) to yellow (480 K), enabling temperature readout through emission-peak shifts with a maximum relative sensitivity (Sr) of 0.72% K−1 and supporting visual temperature monitoring for cold-chain logistics. Under 320 nm excitation, simultaneously activated singlet and triplet dual emissions generate a self-calibrated ratiometric optical thermometer with a maximum Sr of 3.92% K−1. Benefiting from its high PL quantum yield and broadband emission matching chlorophyll absorption, orange-red and white LEDs are fabricated. Plant-cultivation tests on gotu kola, garlic sprouts, and Chinese-cabbage seedlings show enhanced growth and chlorophyll accumulation under these tailored light sources. The material presents a flexible optical material that integrates temperature sensing, self-calibrated thermometry, and plant-growth photoregulation, providing a materials strategy for smart agriculture.
Keywords:
flexible luminescent films
optical thermometry
organic–inorganic metal halides
plant-growth LEDs
Sb3+ doping
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