Researchers from the National Academy of Sciences of Ukraine, led by Prof. Oleg Dimitriev, have performed a study on the influence of the active size and temperature of TADF OLED emitters on the final OLED device performance.
Typically, temperature significantly impacts the performance of OLEDs as these devices degrade as they heat up. However, in TADF emitters, there's actually a remarkable increase in electroluminescence up to one order of magnitude, depending on the applied voltage, as temperature climbs from 18 to 50°C.
The new research reveals that this heat-induced boost in the performance of TADF OLED is also influenced by the device's active area. By varying the active area from 225 to 4 mm2, the researchers show that the thermal enhancement in both electroluminescence and EQE noticeably declines in smaller devices, with the smallest device showing performance deterioration at high temperatures.
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