Jianhui Pan, Wei Liu, Lei Ying, Yue Yu, Xianfeng Qiao, Dezhi Yang, Yuguang Ma, Dongge Ma
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In this article, the aging properties of anthracene derivated PAC and pyrene derivated CPPCN in the fabricated blue fluorescent OLEDs are systematically studied through exciton dynamics theory, and transient electroluminance and impedance spectroscopy measurements. It's experimentally found that the triplet exciton loss caused by IC is responsible for the device degradation. Through doping fluorescent emitter and introducing triplet-triplet annihilation upconversion layers in emissive layer, the IC process is efficiently suppressed and the operational lifetime is enhanced by ≈5.2 and 16 times under the luminance of 1000 cd m<sup>−2</sup> in PAC and CPPCN-based OLEDs, respectively. 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引用次数: 0
摘要
与传统有机荧光分子相比,采用局部和电荷转移杂交(HLCT)工艺的蒽基和芘基有机荧光分子可以通过反向系统间交叉(hRISC)收获高能级三重态(Tn, n≥2)激子,实现激子的高效利用,但Tn到T1的内部转换(IC)会造成严重的激子损失。目前,人们对oled中蒽基和芘基HLCT材料的稳定性差异了解甚少。本文通过激子动力学理论、瞬态电发光和阻抗谱测量,系统地研究了蒽衍生物PAC和芘衍生物CPPCN在制备的蓝色荧光oled中的老化性能。实验发现,集成电路引起的三重态激子损失是器件退化的主要原因。通过掺杂荧光发射极和在发射层引入三重-三重湮灭上转换层,在1000 cd m−2的亮度下,PAC基oled和cppcn基oled的IC过程得到有效抑制,工作寿命分别提高了约5.2倍和16倍。本工作充分论证了蒽基和芘基HLCT分子对器件稳定性影响的差异,为进一步提高基于HLCT分子的蓝色荧光oled的使用寿命提供了依据。
Revealing the Effect of Triplet–Triplet Annihilation Up-Conversion and Improving the Operational Lifetime by Exciton Management in Anthracene- and Pyrene-Based Blue Fluorescent OLEDs
Anthracene- and pyrene-based organic fluorescent molecules with hybridized local and charge-transfer (HLCT) process can achieve highly efficient exciton utilization through harvesting high-lying triplet (Tn, n ≥ 2) excitons via reverse intersystem crossing (hRISC) compared to conventional organic fluorescent molecules, but there exists a serious exciton loss caused by internal conversion (IC) from Tn to T1.Nowadays, the stability difference between anthracene- and pyrene-based HLCT materials in OLEDs is rarely understood. In this article, the aging properties of anthracene derivated PAC and pyrene derivated CPPCN in the fabricated blue fluorescent OLEDs are systematically studied through exciton dynamics theory, and transient electroluminance and impedance spectroscopy measurements. It's experimentally found that the triplet exciton loss caused by IC is responsible for the device degradation. Through doping fluorescent emitter and introducing triplet-triplet annihilation upconversion layers in emissive layer, the IC process is efficiently suppressed and the operational lifetime is enhanced by ≈5.2 and 16 times under the luminance of 1000 cd m−2 in PAC and CPPCN-based OLEDs, respectively. This work fully demonstrates the differences in the effects of anthracene and pyrene-based HLCT molecules on device stability, providing a basis for further improving the operational lifetime of blue fluorescent OLEDs based on HLCT molecules.
期刊介绍:
Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.