近日，华南理工大学彭俊彪团队研究了注入13kA cm⁻²电流、基于TTA的超高辐射OLED。相关论文发表在2026年1月27日出版的《光：科学与应用》杂志上。

有机半导体因其可调控的光电特性和简易的制造工艺，已被广泛应用于显示器、太阳能电池、探测器等领域。然而，制备有机电泵浦激光器仍是一个悬而未决的挑战。有机分子的低迁移率难以维持电泵浦激光所需的高电流注入，且高电流密度下产生的自由载流子和三重态也会猝灭增益特性。在器件制备中，高电导率电极和谐振腔不可避免地伴随光学损耗，这会降低谐振腔的品质因子，并进一步推高电泵浦的阈值电流密度。

研究组制备了一种具有三重态-三重态湮灭特性且电学性能优异的有机发光二极管，可在15纳秒的电脉冲驱动下注入高达13 kA cm^-2的电流密度。通过利用短脉冲驱动缓解三重态积累，并借助TTA效应抑制单重态-三重态湮灭，该器件在1 kA cm^-2的电流注入下仍能保持近1%的外量子效率，并实现了高达56 W cm^-2的纪录性输出功率，足以维持粒子数反转。将此OLED集成于采用超薄电极的高质量分布式布拉格反射镜微腔中，在13 kA cm^-2的电流注入下实现了光谱线宽仅为5.5 nm的窄带发光。这项工作为未来制备具有增益特性的有机电泵浦激光器铺平了道路。

附：英文原文

Title: Ultrahigh-radiance TTA-based OLED with 13 kA cm2 current injection

Author: Zhao, Jichen, Mao, Yu, Liu, Wansheng, Peng, Zengyi, Wang, Xu, Zou, Jianhua, Wang, Jianbin, Chen, Dan, Ma, Dongge, Wu, Hongbin, Hu, Bin, Peng, Junbiao

Issue&Volume: 2026-01-27

Abstract: Organic semiconductors have been widely utilized in displays, solar cells, detectors, and other fields due to their tunable optoelectronic properties and simple fabrication processes. However, fabricating organic electrically pumped lasers remains an unresolved challenge. The low mobility of organic molecules struggles to sustain the current injection required for electrically pumped lasing, and the free carriers and triplets generated under high current density also quench the gain characteristics. In device fabrication, high-conductivity electrodes and resonant cavities are inevitably accompanied by optical losses, which decrease the quality factor of the resonator and further elevate the threshold current density for electrical pumping. Here, we fabricated an organic light-emitting diode (OLED) with triplet-triplet annihilation (TTA) characteristics and excellent electrical performance, capable of injecting a current density of 13kAcm2 under 15-ns electrical pulse driving. By leveraging short-pulse driving to mitigate triplet accumulation and utilizing the TTA effect to suppress singlet-triplet annihilation (STA), the device can still remain nearly 1% external quantum efficiency (EQE) with 1kAcm2 current injection and achieved a record-high output power of 56Wcm2, which can sustain population inversion. The OLED was integrated into a high-quality distributed Bragg reflector (DBR) microcavity with ultrathin electrodes, realizing narrow-band light emission with a spectral linewidth of 5.5nm under 13kAcm2 current injection. This work paves the way for future fabrication of organic electrically pumped lasers with gain characteristics.

DOI: 10.1038/s41377-025-02134-z

Source: https://www.nature.com/articles/s41377-025-02134-z