Abstract
<p indent="0mm">An organic light-emitting diode (OLED) based on rubrene doped with Ir(ppy)<sub>3</sub> was fabricated, and the magneto-electroluminescence (MEL) was used to analyze the optical-electric-magnetic properties and the exciton evolutions of the device under high temperature environment. The study finds that the light emission of the device comes from rubrene. Ir(ppy)<sub>3</sub> does not emit light, and its energy is completely transferred to Rubrene. The high temperature causes traps in the device, which hinders the diffusion and interaction of polaron pairs and excitons, causing the characteristic line of MEL to change from singlet exciton splitting to intersystem crossing. Through spin-orbit coupling and energy transfer, doping Ir(ppy)<sub>3</sub> can effectively enhance the optoelectronic performance and heat resistance of the OLED based on rubrene. This research not only deepens the understanding of the optical-electrical-magnetic properties and micro-mechanism of the OLED based on rubrene under high-temperature environments, but also provides a new method for enhancing the thermal stability of the device.
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