Investigations of microscopic mechanisms in exciplex-based devices with isomers of mCBP and CBP as donors via magneto-electroluminescence

Ning Ya-Ru; Zhao Xi; Tang Xian-Tong; Chen Jing; Wu Feng-Jiao; Jia Wei-Yao; Chen Xiao-Li; Xiong Zu-Hong

doi:10.7498/aps.71.20212068

Abstract

The mCBP and CBP are two kinds of isomers containing carbazole groups and often used as the device hosts for fluorescence and phosphorescence emission. However, there are little studies on the microscopic mechanisms of exciplex-type devices based on mCBP or CBP. In this paper, the isomers of mCBP and CBP are used as donors and the PO-T2T is selected as an acceptor. The two kinds of exciplex-based devices are fabricated according to a mass ratio of 1∶1, which are respectively referred to as device 1 (Dev. 1) and device 2 (Dev. 2). Their magneto-electroluminescence (MEL) curves are measured at different working temperatures and various injection currents. It is found that the low field effects of the MEL curves from Dev. 1 are dominated by the B-mediated reverse intersystem crossing (RISC) process at room temperature, and as the operational temperature decreases, the MEL line-shapes change gradually from RISC to the intersystem crossing (ISC) process. Conversely, the low field effects of the MEL curves of Dev. 2 are governed by the B-mediated ISC process at room temperature, and the ISC process first weakens then strengthens with temperature decreasing. The high field effects of the MEL curves of Dev. 1 and Dev. 2 are both dominated by the B-mediated triplet-charge annihilation (TQA) process at room temperature, but those of Dev. 2 at 20 K present the B-mediated triplet-triplet annihilation (TTA) process. The completely opposite low-field line-shapes of MEL traces from Dev. 1 and Dev. 2 can be attributed to their different structures of mCBP and CBP, which lead to the higher and lower triplet state exciton energy, respectively. The higher triplet exciton energy of the mCBP donor causes the triplet exciplex energy to be confined effectively, which promotes the RISC process (EX₁ ← EX₃) in Dev.1. Contrarily, the lower triplet exciton energy of the CBP donor causes the triplet exciplex to experience an energy loss process (EX₃ → T₁, CBP) , resulting in the suppressed RISC process in Dev. 2. Consequently, the overlapped effects of the ISC process of polaron pairs and the RISC process of exciplex in Dev. 2 under the action of external magnetic field display the ISC-determined process at room temperature. Moreover, the temperature-dependent change in the microscopic process of Dev. 1 such as the conversion from RISC to ISC is because decreasing temperature is not conducive to the occurrence of the RISC process of exciplex states due to its endothermic property. The low-temperature TTA process occurring in Dev. 2 is due to the suppressed energy loss process of triplet exciplex via the Dexter energy transfer from the triplet exciplex to the triplet exciton of CBP donor. In addition, when the mass ratio of mCBP donor to PO-T2T acceptor varies from 1∶4 to 1∶1 to 4∶1, the RISC process of MEL curves of devices turns stronger and stronger, which is because the devices tend more to balance, favoring the RISC process. A higher external quantum efficiency is obtained in the mCBP:PO-T2T host than in the CBP:PO-T2T host when fluorescent guest material of TBRb is used as a dopant in these two exciplex-based devices, which verifies the importance of the effective confinement of triplet exciplex energy in improving the luminescence efficiency. Note that via the MEL detection technology, the current- and temperature-dependent microscopic processes and their reasonable interpretations and device performances from exciplex-based devices with the isomers of mCBP and CBP as donors have not been reported in the literature. This work provides experimental and theoretical references for fabricating the high-efficiency exciplex-based organic light-emitting devices.

Keywords:

Authors and contacts

Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, China

Corresponding author: Xiong Zu-Hong, zhxiong@swu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11874305, 11374242).

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References

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Cited By

图 1 (a) 器件1和器件2的能级排布结构; (b) mCBP和CBP的化学分子结构; (c) mCBP, PO-T2T和mCBP:PO-T2T的归一化PL谱以及器件1的归一化EL谱; (d) CBP, PO-T2T和CBP:PO-T2T的归一化PL谱以及器件2的归一化EL谱

Figure 1. (a) Energy level structures of device 1 and device 2; (b) the chemical structures of mCBP and CBP molecules; (c) normalized PL spectra of mCBP, PO-T2T, and mCBP:PO-T2T and normalized EL spectrum of device 1; (d) normalized PL spectra of CBP, PO-T2T, and CBP:PO-T2T and normalized EL spectrum of device 2.

DownLoad: Full-Size Img PowerPoint

图 2 (a) 室温300 K下器件1在不同注入电流时的MEL曲线; (b) 室温300 K下器件2在不同注入电流时的MEL曲线; (c) 器件1和器件2的MEL_LFE幅值随电流的变化关系; (d) 器件1和器件2的电致发光强度随电流的变化曲线

Figure 2. (a) The MEL curves of device 1 acquired at different injection currents at 300 K; (b) the MEL curves of device 2 obtained at different injection currents at 300 K; (c) MEL_LFE magnitudes of device 1 and device 2 at different injection currents; (d) electroluminescence intensity-current curves of device 1 and device 2.

DownLoad: Full-Size Img PowerPoint

图 3 (a) 器件1的微观机理图; (b) 器件2的微观机理图; (c) 薄膜mCBP:PO-T2T的瞬态PL衰减曲线, 激发波长和监测波长分别是340 nm和488 nm; (d) 薄膜CBP:PO-T2T的瞬态PL衰减曲线, 激发波长和监测波长分别是340 nm和491 nm

Figure 3. (a) Microscopic mechanisms in device 1; (b) microscopic mechanisms in device 2; (c) transient PL decay curves of mCBP:PO-T2T film, the wavelengths of excitation and detection are 340 nm and 488 nm, respectively; (d) transient PL decay curves of CBP:PO-T2T film, the wavelengths of excitation and detection are 340 nm and 491 nm, respectively.

DownLoad: Full-Size Img PowerPoint

图 4 不同温度下不同注入电流的MEL曲线　(a)—(c) 器件1; (d)—(f) 器件2

Figure 4. The MEL curves of device 1 (a)–(c) and device 2 (d)–(f) obtained at different injection currents at different temperatures.

DownLoad: Full-Size Img PowerPoint

图 5 (a) 室温下器件3在不同注入电流时的MEL曲线; (b) 室温下器件4在不同注入电流时的MEL曲线; (c) 室温下电流为5 μA时器件3 (1:4)、器件1 (1:1)和器件4 (4:1)的MEL曲线; (d) 室温下电流为150 μA时器件3、器件1和器件4的MEL曲线

Figure 5. (a) The room temperature MEL curves of device 3 at different injection currents; (b) the room temperature MEL curves of device 4 at different injection currents; (c) the room temperature MEL curves of device 3 (1:4), device 1 (1:1), and device 4 (4:1) at 5 μA; (d) the room temperature MEL curves of device 3, device 1, and device 4 at 150 μA.

DownLoad: Full-Size Img PowerPoint

图 6 (a) 器件5和器件6的能级结构; (b) 器件5和器件6的电流效率-亮度特性曲线; (c) 器件5和器件6的归一化EL谱和TBRb的分子结构; (d) 器件5和器件6的EQE-亮度特性曲线

Figure 6. (a) Energy level structures of devices 5 and 6; (b) current efficiency-luminance characteristics of devices 5 and 6; (c) normalized EL spectra of devices 5 and 6 and molecular structure of TBRb; (d) EQE-luminance characteristics of devices 5 and 6.

DownLoad: Full-Size Img PowerPoint

[1]	Goushi K, Adachi C 2012 Appl. Phys. Lett. 101 023306 Google Scholar
[2]	Goushi K, Yoshida K, Sato K, Adachi C 2012 Nat. Photonics 6 253 Google Scholar
[3]	Kim K H, Yoo S J, Kim J J 2016 ACS Chem. Mater. 28 1936 Google Scholar
[4]	Zhao X, Tang X T, Pan R H, Xu J, Qu F L, Xiong Z H 2019 J. Mater. Chem. C 7 10841 Google Scholar
[5]	Yuan P S, Qiao X F, Yan D H, Ma D G 2018 J. Mater. Chem. C 6 5721 Google Scholar
[6]	Schrögel P, Langer N, Schildknecht C, Wagenblast G, Lennartz C, Strohriegl P 2011 Org. Electron. 12 2047 Google Scholar
[7]	Bagnich SA, Rudnick A, Schroegel P, Strohriegl P, Köhler A 2015 Philos. Trans. R. Soc. London, Ser. A 373 20140446 Google Scholar
[8]	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
[9]	Crooker S A, Liu F, Kelley M R, Martinez N J D, Nie W, Mohite A, Nayyar I H, Tretiak S, Smith D L, Ruden P P 2014 Appl. Phys. Lett. 105 153304 Google Scholar
[10]	Peng Q M, Li W J, Zhang S T, Chen P, Li F, Ma Y G 2013 Adv. Opt. Mater. 1 362 Google Scholar
[11]	Xiang J, Chen Y B, Yuan D, Jia W Y, Zhang Q M, Xiong Z H 2016 Appl. Phys. Lett. 109 103301 Google Scholar
[12]	Chen Y B, Jia W Y, Xiang J, Yuan D, Chen Q S, Chen L X, Xiong Z H 2016 Org. Electron. 39 207 Google Scholar
[13]	Choi W H, Tan G P, Sit W Y, Ho C L, Chan C Y H, Xu W W, Wong W Y, So S K 2015 Org. Electron. 24 7 Google Scholar
[14]	Kim J M, Lee C H, Kim J J 2017 Appl. Phys. Lett. 111 203301 Google Scholar
[15]	Ying S A, Pang P Y, Zhang S A, Sun Q, Dai Y F, Qiao X F, Yang D Z, Chen J S, Ma D G 2019 ACS Appl. Mater. Interfaces 11 31078 Google Scholar
[16]	管胜婕, 周林箭, 沈成梅, 张勇 2020 物理学报 69 167101 Google Scholar Guan S J, Zhou L J, Shen C M, Zhang Y 2020 Acta Phys. Sin. 69 167101 Google Scholar
[17]	Uoyama H, Goushi K, Shizu K, Nomura H, Adachi C 2012 Nature 492 234 Google Scholar
[18]	Tang X T, Hu Y Q, Jia W Y, Pan R H, Deng J Q, Deng J Q, He Z H, Xiong Z H 2018 ACS Appl. Mater. Interfaces 10 1948 Google Scholar
[19]	汤仙童, 邓军权, 胡叶倩, 潘睿亨, 邓金秋, 熊祖洪 2017 中国科学: 技术科学 47 946 Google Scholar Tang X T, Deng J Q, Hu Y Q, Pan R H, Deng J Q, Xiong Z H 2017 Sci. Sin. Technol. 47 946 Google Scholar
[20]	汤仙童, 许静, 邓金秋, 潘睿亨, 胡叶倩, 熊祖洪, 陈晓莉 2018 中国科学: 物理学力学天文学 48 117001 Google Scholar Tang X T, Xu J, Deng J Q, Pan R H, Hu Y Q, Xiong Z H, Chen X L 2018 Sci. Sin-Phys. Mech. Astron. 48 117001 Google Scholar
[21]	Zhang T Y, Chu B, Li W L, Su Z S, Peng Q M, Zhao B, Luo Y S, Jin F M, Yan X W, Gao Y, Wu H R, Zhang F, Fan D, Wang J B 2014 ACS Appl. Mater. Interfaces 6 11907 Google Scholar
[22]	Zhu L P, Xu K, Wang Y P, Chen J S, Ma D G 2015 Front. Optoelectron. 8 439 Google Scholar
[23]	Song W, Lee J Y, Cho Y J, Yu H, Aziz H, Lee K M 2018 Adv. Sci. 5 1700608 Google Scholar
[24]	Desai P, Shakya P, Kreouzis T, Gillin W P 2007 Phys. Rev. B 75 094423 Google Scholar
[25]	Zhao X, Tang X T, Zhu H Q, Ma C H, Wang Y, Ye S N, Tu L Y, Xiong Z H 2021 ACS Appl. Electron. Mater. 3 3034 Google Scholar
[26]	Kim H B, Kim J J 2020 Phys. Rev. Appl. 13 024006 Google Scholar
[27]	Bagnich S A, Niedermeier U, Melzer C, Sarfert W, von Seggern H 2009 J. Appl. Phys. 106 113702 Google Scholar
[28]	Chen D C, Xie G Z, Cai X Y, Liu M, Cao Y, Su S J 2016 Adv. Mater. 28 239 Google Scholar
[29]	陈秋松, 袁德, 贾伟尧, 陈历相, 邹越, 向杰, 陈颖冰, 张巧明, 熊祖洪 2015 物理学报 64 177801 Google Scholar Chen Q S, Yuan D, Jia W Y, Chen L X, Zou Y, Xiang J, Chen Y B, Zhang Q M, Xiong Z H 2015 Acta Phys. Sin. 64 177801 Google Scholar
[30]	Kim K H, Moon C K, Sun J W, Sim B, Kim J J 2015 Adv. Opt. Mater. 3 895 Google Scholar
[31]	Kim H G, Kim K H, Kim J J 2017 Adv. Mater. 29 1702159 Google Scholar
[32]	Tang X T, Pan R H, Zhao X, Jia W Y, Wang Y, Ma C H, Tu L Y, Xiong Z H 2020 Adv. Funct. Mater. 30 2005765 Google Scholar

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