通过调控载流子复合和激子能量传递实现非掺杂WOLED的低效率滚降
Realizing Low Efficiency Roll-Off Doping-Free WOLED by Manipulating Charge Carrier Recombination and Excitons Energy Transfer
摘要: 基于磷光的白色有机发光二极管(WOLED)具有高效率和环境友好等优点，但仍然面临着制作过程复杂、高亮度下效率衰减的严峻挑战。在本文中，基于多个蓝色界面激基复合物并在其插入薄磷光层，制备了具有低效率滚降和无掺杂层的高效磷光体WOLED。我们提出的器件采用策略性激子管理，通过界面激基复合物对三重态能量进行限制。抑制了高亮度下激子浓度增加所引起的三重态–三重态湮灭(TTA)。同时采用PO-T2T/TPBi异质结有效地减少载流子捕获，有效地降低了载流子俘获所引起的三重态–极化子湮灭(TPA)。所得到的无掺杂的磷光WOLED的最大电流效率(CE)和功率效率(PE)为47.9 cd/A和50.1 lm/W，且3000 cd/m2亮度下的电流效率仍为40.0 cd/A，在无掺杂WOLED中达到了极低的效率滚降。我们的方法为克服无掺杂磷光体WOLED中三重态激子浓度猝灭和载流子俘获所引起的效率衰减提供了一条有效的途径。
Abstract: White organic light-emitting diode (WOLED) based on phosphor has the advantages of high efficiency and environmental friendliness, but it still faces severe challenges such as complex production process and efficiency roll-off at high luminance. In this paper, a high efficiency phos-phor WOLED with efficiency low roll-off and non-doped layer was fabricated based on multiple blue interfacial exciplexes and inserting thin phosphor layers into them. The proposed device adopts strategic exciton management, and the triplet energy is limited by the interfacial exciplex. The triplet-triplet annihilation (TTA) caused by the increase of exciton concentration at high luminance is suppressed at the same time, PO-T2T/TPBi heterojunction is used to effectively reduce charge carrier capture and effectively reduces triplet-polaron annihilation (TPA) caused by carrier trapping. The maximum current efficiency (CE) and power efficiency (PE) of the obtained non-doped phosphor WOLED are 47.9 cd/A and 50.1 lm/W, and the current efficiency at 3000 cd/m2 luminance is still 40.0 cd/A, which achieves extremely low efficiency roll-off in non-doped WOLED. Our method provides an effective way to overcome the efficiency roll-off caused by triplet exciton concentration quenching and charge carrier trapping in non-doped phosphor WOLED.
文章引用：王彦博, 朱鑫宇. 通过调控载流子复合和激子能量传递实现非掺杂WOLED的低效率滚降[J]. 应用物理, 2023, 13(4): 118-125. https://doi.org/10.12677/APP.2023.134014

参考文献

[1] Yao, J.W., Ying, S.A., Qiao, X.F., et al. (2019) High Efficiency and Low Roll-Off All Fluorescence White Organic Light-Emitting Diodes by the Formation of Interface Exciplex. Organic Electronics, 67, 72-78. [Google Scholar] [CrossRef] 
[2] Liu, D., Zhu, W.Q., Huang, L., et al. (2021) Multiple Emission Mechanism Based Four-Peak Tuning Strategy to Achieve Ultra-High Color Rendering Index and Chromatic-Stable White Organic Light Emitting Diodes. Optical Materials, 113, Article ID: 110587. [Google Scholar] [CrossRef] 
[3] Chen, T.Q., Li, J., Cao, J. and Yang, J. (2021) Spec-trum-Stable Tetra-Chromatic White Organic Light-Emitting Diodes with Red Emitter outside the Exciton Recombi-nation Zone. Optical Materials, 117, Article ID: 111150. [Google Scholar] [CrossRef] 
[4] Wang, L.J., Kou, Z.Q., Wang, B.Q., et al. (2021) Realizing High Efficiency/CRI/Color Stability in the Hybrid White Organic Light Emitting Diode by Manipulating Exciton Energy Transfer. Optical Materials, 115, Article ID: 111059. [Google Scholar] [CrossRef] 
[5] Cho, E., Hong, M., Yang, Y.S., et al. (2022) Energy Transfer Processes in Hyperfluorescent Organic Light-Emitting Diodes. Journal of Materials Chemistry C, 10, 4629-4636. [Google Scholar] [CrossRef] 
[6] Schwartz, G., Pfeiffer, M., Reineke, S., et al. (2007) Harvesting Triplet Excitons from Fluorescent Blue Emitters in White Organic Light-Emitting Diodes. Advanced Materials, 19, 3672-3676. [Google Scholar] [CrossRef] 
[7] Chen, Y., Wu, Y., Lin, C., et al. (2020) Simultaneous High Efficiency/CRI/Spectral Stability and Low Efficiency Roll-Off Hybrid White Organic Light-Emitting Diodes via Simple Insertion of Ultrathin Red/Green Phosphorescent Emitters in a Blue Exciplex. Journal of Materials Chemistry C, 8, 12450-12456. [Google Scholar] [CrossRef] 
[8] Chen, Y., Sun, Q., Dai, Y., et al. (2019) EL Properties and Exciton Dynamics of High‐Performance Doping-Free Hybrid WOLEDs Based on 4P‐NPD/Bepp2 Heterojunction as Blue Emitter. Advanced Optical Materials, 7, Article ID: 1900703. [Google Scholar] [CrossRef] 
[9] Miao, Y., Wang, K., Zhao, B., et al. (2018) High-Efficiency/CRI/Color Stability Warm White Organic Light-Emitting Diodes by Incorporating Ultrathin Phos-phorescence Layers in a Blue Fluorescence Layer. Nanophotonics, 7, 295-304. [Google Scholar] [CrossRef] 
[10] Ying, S., Yuan, J., Zhang, S., et al. (2019) High Efficiency Warm White Organic Light-Emitting Diodes with Precise Confinement of Charge Carriers and Excitons in the Ex-ciplex Host System. Journal of Materials Chemistry C, 7, 7114-7120. [Google Scholar] [CrossRef] 
[11] Zhang, S., Yao, J., Dai, Y., et al. (2020) High Efficiency and Color Quality Undoped Phosphorescent White Organic Light-Emitting Diodes Based on Simple Ultrathin Structure in Ex-ciplex. Organic Electronics, 85, Article ID: 105821. [Google Scholar] [CrossRef] 
[12] Ying, S., Sun, Q., Dai, Y., et al. (2019) Precise Regulation of the Emissive Layer for Ultra-High Performance White Organic Light-Emitting Diodes in an Exciplex Forming Co-Host System. Materials Chemistry Frontiers, 3, 640-649. [Google Scholar] [CrossRef] 
[13] Li, A., Sun, M.Y., Yang, L.P., et al. (2021) Improved Efficiency, Stable Spectra and Low Efficiency Roll-Off Achieved Simultaneously in White Phosphorescent Organic Light-Emitting Diodes by Strategic Exciton Management. Organic Electronics, 97, Article ID: 106262. [Google Scholar] [CrossRef] 
[14] Wang, Z., Liu, Z., Zhang, H., et al. (2018) Highly Efficient and Spectra Stable Warm White Organic Light-Emitting Diodes by the Application of Exciplex as the Excitons Adjustment Layer. Organic Electronics, 62, 157-162. [Google Scholar] [CrossRef] 
[15] Miao, Y., Wang, K., Gao, L., et al. (2018) Precise Manipula-tion of the Carrier Recombination Zone: A Universal Novel Device Structure for Highly Efficient Monochrome and White Phosphorescent Organic Light-Emitting Diodes with Extremely Small Efficiency Roll-Off. Journal of Mate-rials Chemistry C, 6, 8122-8134. [Google Scholar] [CrossRef] 
[16] Zhang, T., Yao, J., Zhang, S., et al. (2021) Highly Efficient and Low Efficiency Roll-Off Organic Light-Emitting Diodes with Double-Exciplex Forming Co-Hosts. Journal of Materials Chemistry C, 9, 6062-6067. [Google Scholar] [CrossRef] 
[17] Li, M., Tao, Z., Peng, Y., et al. (2022) Facile Fabrication of Mul-ti-Color Electroluminescent Devices by Tricomponent Exciplex Regulation. Organic Electronics, 101, Article ID: 106421. [Google Scholar] [CrossRef] 
[18] Ye, J., Zheng, C.J., Ou, X.M., et al. (2012) Man-agement of Singlet and Triplet Excitons in a Single Emission Layer: A Simple Approach for a High‐Efficiency Fluorescence/Phosphorescence Hybrid White Organic Light-Emitting Device. Advanced Materials, 24, 3410-3414. [Google Scholar] [CrossRef] [PubMed]
[19] Sun, N., Wang, Q., Zhao, Y., et al. (2014) High-Performance Hybrid White Organic Light-Emitting Devices without Interlayer between Fluorescent and Phosphorescent Emissive Regions. Advanced Materials, 26, 1617-1621. [Google Scholar] [CrossRef] [PubMed]
[20] Ying, S., Yang, D., Qiao, X., et al. (2018) Improvement of Ef-ficiency and Its Roll-Off at High Brightness in White Organic Light-Emitting Diodes by Strategically Managing Triplet Excitons in the Emission Layer. Journal of Materials Chemistry C, 6, 10793-10803. [Google Scholar] [CrossRef] 
[21] Ying, S., Chen, Y., Yao, J., et al. (2020) High Efficiency Dop-ing-Free Warm-White Organic Light-Emitting Diodes with Strategic-Tuning of Radiative Excitons by Combining Interfacial Exciplex with Multi-Ultrathin Emissive Layers. Organic Electronics, 85, Article ID: 105876. [Google Scholar] [CrossRef] 
[22] Zhang, J.M., Liu, S.H., Chen, Y.F., et al. (2021) Sim-ple-Structure Color-Tunable Fluorescent Organic Light-Emitting Devices with Chromaticity Difference beyond Five-Step McAdam Ellipses. Journal of Physics D: Applied Physics, 54, Article ID: 505103. [Google Scholar] [CrossRef] 

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