The Role of Photon Recycling in Enhancing the Performance of Perovskite Light-Emitting Diodes
발표자
정다연 (포항공과대학교)
연구책임자
조창순 (포항공과대학교)
공동저자
정다연 (포항공과대학교), 조창순 (포항공과대학교)
초록
내용
Perovskites are gaining attention as promising materials for next-generation optoelectronic devices, particularly in solar cells and light-emitting diodes (LEDs), due to their high performance and optical properties. Perovskite LEDs have been optimized to achieve external quantum efficiencies over 20%. Unlike organic light emitters, perovskites have high refractive indices (n > 2), leading to a low theoretical light extraction limit of 1/2n² (<12%). However, recent experimental results show efficiencies much higher than this limit. This discrepancy is mainly due to the photon recycling effect, where reabsorbed photons in trapped optical modes are reemitted, in addition to the microcavity effect. This study investigates the role of photon recycling in enhancing perovskite LED performance by quantifying external efficiencies. We propose an optical model that includes emitter reabsorption, offering design guidelines for efficient perovskite LEDs, distinct from organic LEDs.