Wu Chengcheng, Tong Kai-Ning, Shi Kefei, Jin Zhaoyun, Wu Yuan, Mu Yingxiao, Huo Yanping, Tang Man-Chung, Yang Chen, Meng Hong, Kang Feiyu, Wei Guodan
Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518055, China.
Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Adv Sci (Weinh). 2023 Oct;10(29):e2301112. doi: 10.1002/advs.202301112. Epub 2023 Aug 31.
Two newly designed and synthesized [3+2+1] iridium complexes through introducing bulky trimethylsiliyl (TMS) groups are doped with a terminal emitter of v-DABNA to form an coincident overlapping spectra between the emission of these two phosphors and the absorption of v-DABNA, creating cascade resonant energy transfer for efficient triplet harvesting. To boost the color quality and efficiency, the fabricated hyper-OLEDs have been optimized to achieve a high external quantum efficiency of 31.06%, which has been among the highest efficiency results reported for phosphor sensitized saturated-blue hyper-OLEDs, and pure blue emission peak at 467 nm with the full width at half maxima (FWHM) as narrow as 18 nm and the CIEy values down to 0.097, satisfying the National Institute of Standards and Technology (NIST) requirement for saturated blue OLEDs display. Surprisingly, such hyper-OLEDs have obtained the converted lifetime (LT ) up to 4552 h at the brightness of 100 cd m , demonstrating effective Förster resonance energy transfer (FRET) process. Therefore, employing these new bulky TMS substituent [3+2+1] iridium(III) complexes for effective sensitizers can greatly pave the way for further development of high efficiency and stable blue OLEDs in display and lighting applications.
通过引入庞大的三甲基硅基（TMS）基团，新设计并合成了两种[3+2+1]铱配合物，它们与v-DABNA末端发射体掺杂，使得这两种磷光体的发射与v-DABNA的吸收形成重合的重叠光谱，从而实现级联共振能量转移以高效捕获三线态。为提高颜色质量和效率，对制备的超有机发光二极管（hyper-OLED）进行了优化，以实现31.06%的高外量子效率，这是磷光体敏化饱和蓝光超有机发光二极管报道的最高效率结果之一，在467nm处有纯蓝光发射峰，半高宽窄至18nm，CIEy值低至0.097,满足美国国家标准与技术研究院（NIST）对饱和蓝光OLED显示的要求。令人惊讶的是，这种超有机发光二极管在100cd m亮度下的转换寿命（LT）高达4552小时，证明了有效的福斯特共振能量转移（FRET）过程。因此，使用这些带有庞大TMS取代基的新型[3+2+1]铱（III）配合物作为有效的敏化剂，可为显示和照明应用中高效稳定的蓝色OLED的进一步发展铺平道路。
