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首页> 外文期刊>Advanced functional materials >Fabrication of Flexible High-Temperature Film Thermometers and Heat-Resistant OLEDs Using Novel Hot Exciton Organic Fluorophores
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Fabrication of Flexible High-Temperature Film Thermometers and Heat-Resistant OLEDs Using Novel Hot Exciton Organic Fluorophores

机译：Fabrication of Flexible High-Temperature Film Thermometers and Heat-Resistant OLEDs Using Novel Hot Exciton Organic Fluorophores

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The development of organic thermosensitive fluorophores for use in heatresistant organic light emitting diodes (OLEDs) and large-area and flexible high-temperature sensing remains challenging due to the susceptibility of such materials to thermally facilitated nonradiative decay. A series of “hot exciton” materials (“C1” and “C2”) based on pyrrole-substituted triarylphosphine oxides that exhibit high heat resistance have been developed. At a temperature of 260 ℃, the films retain 42% (C1) and 29% (C2) of their room temperature fluorescence. This is thanks to thermally facilitated reverse intersystem crossing (RISC) from a high-lying triplet to a singlet state. By combining the novel fluorophores with a yellow emitter with an extremely large Stokes shift, flexible and large-area ratiometric film thermometers are fabricated that demonstrate naked-eye high-temperature sensing. The relative sensitivity, S_r, of the film thermometer is higher than 1% K~(-1) in the high-temperature region (393 to 470 K), with the maximum S_r reaching 1.26% K~(-1) at 430 K. Using these blue emitters, heat-resistant cyan and white OLEDs are also fabricated. With thermally populated singlets and nearly 100% exciton harvesting via fast RISC, the C1-based cyan OLED exhibits a nearly 12-fold enhancement in electroluminescence on heating from room temperature to 530 K, while the corresponding white OLED displays a 5.7-fold electroluminescence enhancement.

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