Huang Yu-Ting, Chang Chung-Chieh, Chang Che-Lun, Hsu Wei-Tse, Li Yun-Rong, Yang Zu-Po, Lu Chin-Wei, Su Hai-Ching
Department of Applied Chemistry, Providence University, Taichung 43301, Taiwan.
Institute of Lighting and Energy Photonics, National Yang Ming Chiao Tung University, Tainan 71150, Taiwan.
Inorg Chem. 2025 Jun 2;64(21):10402-10413. doi: 10.1021/acs.inorgchem.5c00167. Epub 2025 May 19.
Light-emitting electrochemical cells (LECs) provide a cost-effective solution for lighting applications and are well-suited for large-area and industrial-scale manufacturing. However, enhancing the efficiency of LECs remains a significant challenge. To address this issue, this study presents a series of blue-green iridium complexes with promising phosphorescent emission properties. Among these, di[1-(2,4-difluorophenyl)-pyrazolyl]-5,5'-difluoro-2,2'-bipyridyl iridium(III) hexafluorophosphate stands out, demonstrating exceptional performance. Following optimizing the device with varying thicknesses, an EQE of 16.8% and a current efficiency of 47.2 cd A were attained. Further enhancements through the integration of a diffusive layer resulted in a 270% increase in efficiency, reaching an EQE of 39.3% and current efficiency of 109.6 cd A. This efficient technology demonstrates significant potential and lays the groundwork for future high-performance light-emitting devices.
发光电化学电池（LEC）为照明应用提供了一种经济高效的解决方案，非常适合大面积和工业规模的制造。然而，提高LEC的效率仍然是一项重大挑战。为了解决这个问题，本研究提出了一系列具有良好磷光发射特性的蓝绿色铱配合物。其中，二[1-(2,4-二氟苯基)-吡唑基]-5,5'-二氟-2,2'-联吡啶铱(III)六氟磷酸盐表现突出，展现出卓越的性能。通过优化不同厚度的器件，获得了16.8%的外量子效率（EQE）和47.2 cd/A的电流效率。通过集成扩散层进一步提高效率，效率提高了270%，达到了39.3%的EQE和109.6 cd/A的电流效率。这种高效技术显示出巨大的潜力，并为未来高性能发光器件奠定了基础。
