Reasons for “disappearance” phenomenon of both intersystem crossing of polaron-pair states and reverse intersystem crossing of high-lying triplet excitons in pure Rubrene-based OLEDs

Wang Hui-Yao; Ning Ya-Ru; Wu Feng-Jiao; Zhao Xi; Chen Jing; Zhu Hong-Qiang; Wei Fu-Xian; Wu Yu-Ting; Xiong Zu-Hong

doi:10.7498/aps.71.20221060

Abstract

With unique advantages of high sensitivity, no-contact, and non-destructiveness, magneto-electroluminescence (MEL) is usually employed as an effective detection tool to visualize the microscopic mechanisms of excited states existing in organic light-emitting diodes (OLEDs) because their evolution channels of many spin-pair states in OLEDs have the fingerprint MEL line-shapes even with opposite signs. The recently-published MEL results (Tang X T, Pan R H, Zhao X, Jia W Y, Wang Y, Ma C H 2020 Adv. Funct. Mater. 5 765) have demonstrated the existence of high-level reverse intersystem crossing process (HL-RISC, S_1,Rub ← T_2,Rub) of high-lying triplet excitons (T_2,Rub) in Rubrene when Rubrene with a typical value of several percent in content is doped into a host with high triplet exciton energy and there are no energy loss channels of triplet excitons from charge-carrier transporting layers either. Furthermore, this HL-RISC process can considerably increase the efficiency and brightness of OLEDs operated at room temperature, for example, high external quantum efficiency up to 16.1% and ten thousands of brightness have been achieved in Rubrene-doped OLEDs with a co-host of exciplex. Herein, surprisingly, in the pure Rubrene-based OLEDs (i.e. the pure Rubrene film is used as an emissive layer) with no energy loss channels of triplet excitons from charge-carrier transporting layers, only strong singlet fission (S_1,Rub+S_0,Rub → T_1,Rub+T_1,Rub) processes are detected at room temperature, but this HL-RISC process is not observed. Moreover, even the most usual evolution process of intersystem crossing of polaron-pair (ISC, PP₁ → PP₃) cannot be observed in this pure Rubrene-based OLEDs, where the polaron-pair is generated through the recombination of the injected electrons and holes in the pure Rubrene emissive layer. To determine the cause of the underlying physical mechanism behind this abnormal and fascinating experimental phenomena, two kinds of devices with pure Rubrene and 5% Rubrene-dopant as emissive layers are fabricated and their current- and temperature- dependent MEL responses are systematically investigated. By comparing and analyzing these tremendously different MEL curves of these two types of devices, we find that the positive Lorentzian MEL curves induced from B-mediated ISC of polaron-pair just completely cancel out the negative Lorentzian MEL curves induced from B-mediated HL-RISC process of T_2,Rub excitons. Note that such an abnormal and coincidental experimental phenomenon is the physical reason why the ISC process and HL-RISC process cannot be observed simultaneously in the pure Rubrene-based OLEDs, and this phenomenon has not been found in the literature. Clearly, this work further deepeneds our understanding of some unique microscopic processes and physical phenomena in organic semiconductor “star” material of Rubrene (such as the energy resonance between 2T₁ and S₁ and the energy approach between T₂ and S₁).

Keywords:

Authors and contacts

1.
Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, China
2.
Chongqing Key Laboratory of Optoelectronic Functional Materials, School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China

Corresponding author: Zhu Hong-Qiang, 20132013@cqnu.edu.cn ; Xiong Zu-Hong, zhxiong@swu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12104076, 11874305), the Chongqing Natural Science Foundation Project, China (Grant No. cstc2019jcyj-msxmX0560), and the University-level Foundation of Chongqing Normal University, China (Grant No. 21XLB050).

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References

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Cited By

图 1 (a) 器件A中每个功能层的能级图; (b) 室温下器件A在50 μA时的MEL曲线, 插图展示了器件A归一化的EL光谱; (c) 器件A的微观机制过程; (d) 采用三种过程(ISC, HL-RISC, SF)拟合器件A的MEL曲线

Figure 1. (a) Energy level alignments of each functional layer used in device A; (b) the room-temperature MEL curves of device A operated at a bias current of 50 μA, the inset shows the normalized EL spectrum of device A; (c) micro-mechanism diagram of device A; (d) fitted MEL curve of device A using three different processes (ISC, HL-RISC, and SF).

DownLoad: Full-Size Img PowerPoint

图 2 器件A在不同温度下电流依赖的MEL曲线　(a) 300 K; (b) 200 K; (c) 100 K; (d) 10 K. 图2(b)的插图是器件A在200 K时, 磁场为50 mT的MEL曲线

Figure 2. I-dependent MEL curves of device A obtained at various operational temperatures: (a) 300 K; (b) 200 K; (c) 100 K; (d) 10 K. The illustration in Fig. 2(b) shows the MEL curves of device A at 50 mT magnetic field and 200 K.

DownLoad: Full-Size Img PowerPoint

图 3 掺杂器件的能级排布图及其室温下电流依赖的MEL曲线　(a), (c) 器件B; (b), (d) 器件C

Figure 3. Energy level alignments of the doped devices and their I-dependent MEL curves at room temperature: (a), (c) Device B;(b), (d) device C

DownLoad: Full-Size Img PowerPoint

图 4 器件B与器件C的微观机理示意图

Figure 4. Schematic diagram of micro-mechanisms for device B and device C.

DownLoad: Full-Size Img PowerPoint

图 5 在200, 100, 10 K下电流依赖的MEL曲线　(a)—(c) 器件B; (d)—(f) 器件C

Figure 5. I-dependent MEL curves obtained at operational temperatures of 200, 100, 10 K: (a)–(c) Device B; (d)–(f) device C.

DownLoad: Full-Size Img PowerPoint

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[4]	卢晨蕾, 贾伟尧, 白江文, 张巧明, 令勇洲, 刘洪, 熊祖洪 2015 中国科学: 技术科学 45 396 Google Scholar Lu C L, Jia W Y, Bai J W, Zhang Q M, Ling Y Z, Liu H, Xiong Z H 2015 Sci. Sin.-Tech. 45 396 Google Scholar
[5]	Liu Y, Wu X M, Zhao Z H, Gao J N, Zhan J, Rui H S, Lin X, Zhang N, Hua Y L, Yin S G 2017 Appl. Surf. Sci. 413 302 Google Scholar
[6]	Qu F L, Jia W Y, Tang X T, Xu J, Zhao X, Ma C H, Ye S N 2020 J. Phys. Chem. C. 124 9451 Google Scholar
[7]	Chen Q S, Jia W Y, Chen L X 2016 Sci. Rep. 6 25331 Google Scholar
[8]	Tang X T, Pan R H, Zhao X, Jia W Y, Wang Y, Ma C H 2020 Adv. Funct. Mater. 5 765 Google Scholar
[9]	Wang Y, Ning Y R, Wu F G, Chen J, Chen X L, Xiong Z H 2022 Adv. Funct. Mater. 32 2202882 Google Scholar
[10]	张勇, 刘亚莉, 焦威, 陈林, 熊祖洪 2012 物理学报 61 117106 Google Scholar Zhang Y, Liu Y L, Jiao W, Chen L, Xiong Z H 2012 Acta Phys. Sin. 61 117106 Google Scholar
[11]	Tang X T, Zhao X, Tu L Y, Ma C H, Wang Y, Ye S N 2021 J. Mater. Chem. C 9 2775 Google Scholar
[12]	Tang X T, Pan R H, Zhao X 2020 J. Phys. Chem. Lett. 11 2804 Google Scholar
[13]	Li J, Chen Z H, Zhang Q M, Xiong Z H, Zhang Y 2015 Org. Electron. 26 213 Google Scholar
[14]	Xu Y W, Xu P, Hu D H, Ma Y G, 2021 Chem. Soc. Rev. 50 1030 Google Scholar
[15]	Bai J W, Chen P, Lei Y L, Zhang Y, Zhang Q M 2014 Org. Electron. 15 169 Google Scholar
[16]	Piland G B, Burdett J J, Kurunthu D, Bardeen C J 2013 J. Phys. Chem. C 117 1224 Google Scholar
[17]	Chen Y B, Jia W Y, Xiang J, Yuan D, Chen Q S, Chen L X 2016 Org. Electron. 39 207 Google Scholar
[18]	Zhang Y, Lei Y L, Zhang Q M, Xiong Z H 2014 Org. Electron. 15 577 Google Scholar
[19]	Desai P, Shakya P, Kreouzis T, Gillin W P 2007 Phys. Rev. B 75 094423 Google Scholar
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[21]	Kawata S, Pu Y J, Saito A, Kurashige Y K, Beppu T, Katagiri H S, Hada, M Kido J J 2016 Adv. Mater. 28 1585 Google Scholar
[22]	Hu D H, Yao L, Yang B, Ma Y G 2015 Phil. Trans. R. Soc. A 373 20140318 Google Scholar
[23]	Pan Y Y, Li W J, Zhang S T, Yao L, Gu C, Xu H, Yang B, Ma Y G 2014 Adv. Opt. Mater. 2 510 Google Scholar
[24]	Kim H B, Kim J J 2020 Phys. Rev. Appl. 13 024006 Google Scholar
[25]	Obolda A, Peng Q M, He C, Zhang T, Ren J J, Ma H W, Shuai Z G, Li F 2016 Adv. Mater. 28 4740 Google Scholar
[26]	Tu L Y, Tang X T, Wang Y, Zhao X, Ma C H, Ye S N 2021 Phys. Rev. Appl. 16 064002 Google Scholar
[27]	Wang F J, Bassler H, Vardeny Z V 2008 Phys. Rev. Lett. 101 236805 Google Scholar
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[29]	Peng Q M, Li W J, Zhang S T, Chen P, Li F, Ma Y G 2013 Adv. Opt. Mater. 1 362 Google Scholar
[30]	Peng Q M, Li A M, Fan Y X, Chen P, Li F 2014 J. Phys. Chem. C 2 6264 Google Scholar
[31]	Huh D H, Kim G W, Kim G H, Kulshreshtha C, Kwon J H 2013 Synth. Net. 180 79 Google Scholar
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[34]	宁亚茹, 赵茜, 汤仙童, 陈敬, 吴凤娇, 贾伟尧, 陈晓莉, 熊祖洪 2022 物理学报 71 087201 Google Scholar Ning Y R, Zhao X, Tang X T, Chen J, Wu F J, Jia W R, Chen X L, Xiong Z H 2022 Acta Phys. Sin. 71 087201 Google Scholar
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