Heat Resistant Organic Dyes for High Temperature Luminescent Temperature Sensing

Xuesen Qian, Mengfei Kong, Linyi Song, Guochang Yue, Yong Zhang, Yan Qian, Quli Fan
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Abstract

Compliant and large-area high-temperature gradient sensing is essential for scientific and industrial applications but remains a big challenge. Although organic luminophores have intrinsic advantages of flexibility and solution processability, they generally suffer from significant emission quenching at high temperatures due to thermally facilitated nonradiative decay. Herein, a heat-resistant blue emitter of C3 based on triarylphosphine oxide has been developed, due to the thermal population of the higher emissive state from its lowest excited state. Based on this, hybridization of C3 with a faster thermally-deactivated yellow dye of T4AC which exhibits a large Stokes shift enables blocking of energy transfer and independent thermal response of the two respective emitters. Thus, sensitive ratiometric film thermometers for high-temperature sensing can be constructed. The relative sensitivity (Sr) reaches 1.27%°C−1 at 128 °C and the temperature resolution is < 0.77 °C in a wide sensing range of 20–240°C. Moreover, naked-eye thermal mapping and multiple anti-counterfeiting of these ratiometric films have also been demonstrated.

Abstract Image

用于高温发光温度传感的耐热有机染料
符合要求的大面积高温梯度传感对科学和工业应用至关重要,但仍然是一个巨大的挑战。虽然有机发光体具有灵活性和溶液可加工性等固有优势,但由于热促进非辐射衰变,它们通常在高温下会出现明显的发射淬灭。在此,我们开发了一种基于三芳基氧化膦的 C3 耐热蓝色发射体,这是由于高发射态可从其最低激发态受热产生。在此基础上,将 C3 与热失活较快的 T4AC 黄色染料杂交,后者会产生较大的斯托克斯偏移,从而阻断能量传递,并使两种发射器各自产生独立的热响应。因此,可以构建用于高温传感的灵敏比率薄膜温度计。在 128°C 时,相对灵敏度 (Sr) 达到 1.27%°C-1,在 20-240°C 的宽传感范围内,温度分辨率小于 0.77°C。此外,这些比率膜的裸眼热成像和多重防伪功能也已得到验证。
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