Analyzing Charge Transport and Emission Process in OLEDs through Transient Electroluminescence

초록

Organic light-emitting diodes (OLEDs) rely on efficient charge transport and recombination for optimal performance. Transient electroluminescence (Tr-EL) is a powerful technique for investigating these processes by analyzing time-dependent light emission after voltage modulation. This study explores charge carrier dynamics in OLEDs, focusing on the correlation between real device performance and behavior of charge trapping, accumulation, and release. Different transient responses, such as overshoot phenomena, provide insights into exciton formation, carrier mobility, and recombination mechanisms. By correlating Tr-EL characteristics with device structures, we identify factors influencing charge balance and efficiency losses. The results related to overshoot (carrier trapping) and delayed emission contribute to a deeper understanding of charge transport and exciton dynamics, offering strategies to enhance OLED efficiency and stability. This study highlights the importance of controlling charge carrier behavior to minimize energy losses and improve device lifetime, aiding the development of next-generation OLEDs with superior performance. © 2025 SPIE. All rights reserved.

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