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Perovskite light emitting diodes (PeLEDs) have developed rapidly in recent years due to their advantages of tenability of band gap and high color purity. At present, the external quantum efficiency of PeLED has rised up to 20%. Like the scenario of organic light emitting diode, there exist various internal losses in PeLED with low light extraction efficiency. It arises from the absorption of substrates, waveguide transmission and surface plasmon resonance of metal electrode. To improve the luminescence performance of PeLED, a well-matched optical admittance between the thin-films inside the devices is required. In this paper, the strategies of enhancing the light extraction efficiency are adopted as the materials and structures in PeLED are concerned. The applications of alternative electrode in PeLED are discussed, such as graphene, silver nanowires, metal transparent electrode and some new-types of electrodes. In addition, the plasma effect is also introduced into the PeLED to deflect the emitting light. What is more, the nano-structure grating is inserted into device to reduce the optical losses due to the large refractive index difference between the interfaces in device. Therefore, the external quantum efficiency of PeLED rises up to 28.2%, and the current efficiency can reach 88.7 cd/A.
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Keywords:
- perovskite /
- light emitting diodes /
- light extraction /
- efficiency
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图 4 PeLED电极为ZnO-Ag-ZnO结构: (a) ZnO-Ag-ZnO结构示意图: 底部为ZnO, 中间为Ag层, 顶部为ZnO层; (b)电极分别为ITO和m-ZnO-Ag-ZnO的器件电压-电流效率图(插图显示了在5 V条件下器件的辐射性)[28]
Figure 4. PeLED with ZnO-Ag-ZnO electrode: (a) ZnO-Ag-ZnO structure: bottom wetting ZnO layer, middle patterned Ag layer and top continuous ZnO layer; (b) current efficiency-voltage curves with ITO and ZnO-Ag-ZnO electrode (insets show the magnified view of emission uniformity on 5 V)[28].
表 1 PeLEDs光提取研究进展
Table 1. Research progress of PeLEDs light extraction.
发表
时间器件结构 光提取方法 CEmax/cd·A–1 EQEmax/% 最大亮度/cd·m–2 寿命参数T50 参考
文献2017 4LG/Buf-HIL/MAPbBr3/TPBi/LiF/Al 电极 18.0 3.8 13000 — [25] 2018 Ag/(ZnO/PEI)/CsPbI3NC /TCTA/(MoO3/Au/MoO3) 电极 — 11.2 1106 — [26] 2018 Au/HIL/MAPbBr3/TPBi/LiF/AL 电极 3.3 — 11270 — [27] 2019 m-ZAgZ/HAT-CN/TAPC/CsPbBr3/TPBi/Liq/Al 电极 7.21 — 4846 — [28] 2018 Glass/AnoHIL/MAPbBr3/TPBi/Li/AL 电极 42 8.66 — — [29] 2020 Glass/Au/ZnO/MQW perovskite/
TFB/MoO3/Au电极
微腔— 20.2 — — [31] 2017 Glass/ITO/PEDOT:PSS/(Agrods NPB)/
CsPbBr3 NC/TPBi/LiF/Al激元 1.42 0.43 8911 — [33] 2017 Au NPs/PVK:MAPbBr3:TPBi/
TPBi/Cs2CO3/Al激元 7.64 1.83 16050 — [34] 2019 Glass/NHAs/ITO/Poly-TPD/MAPbI3/TPBi/LiF/Al 微纳 — 0.012 0.53 W·sr –1·m–2 — [36] 2019 Glass/Epoxy/AAM(TiO2)/ITO/PEDOT:PSS/
BA: CH3 NH3 PbBr3/F8/Ca/Ag微纳 — 17.5 48668 120 s [38] 2019 Glass/ITO/ZnO/PEDOT:PSS/
CsPbBr3/TPBi/LiF/Al微纳 88.7 28.2 ~25000 — [12] 2018 Glass/ITO/ZnO/ZnO-PEIE/
FAPbI3/TFB/MoOx/Au薄膜形貌 — 20.7 390 W·sr –1· m–2 20 h [11] 2020 Glass/ITO/ PEDOT:PSS/Perovskite/
B3PyMPM/LiF/Al器件结构 — 17.6 79700 — [39] -
[1] Wang J P, Wang N N, Jin Y Z, Si J J, Tan Z K, Du H, Cheng L, Dai X L, Bai S, He H P, Ye Z Z, Lai M L, Friend R H, Huang W 2015 Adv. Mater. 27 2311
Google Scholar
[2] Meng F Y, Liu X Y, Chen Y X, Cai X Y, Li M K, Shi T T, Chen Z M, Chen D C, Yip H L, Ramanan C, Blom P W M, Su S J 2020 Adv. Funct. Mater. 2020 1910167
Google Scholar
[3] Lee S J, Park J H, Nam Y S, Lee B R, Zhao B D, Nuzzo D D, Jung E D, Jeon H, Kim J Y, Jeong H Y, Friend R H, Song M H 2018 ACS Nano 12 3417
Google Scholar
[4] Tan Z K, Moghaddam R S, Lai M L, Docampo P, Higler R, Deschler F, Price M, Sadhanala A, Pazos L M, Credgington D, Hanusch F, Bein T, Snaith H J, Friend R H 2014 Nat. Nanotechnol. 9 687
Google Scholar
[5] Quan L N, Arquer F P G D, Sabatini R P, Sargent E H 2018 Adv. Mater. 30 1801996
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[6] Wei Z H, Xing J 2019 J. Phys. Chem. Lett. 10 3035
Google Scholar
[7] Zou Y, Yuan Z, Bai S, Gao F, Sun B 2019 Mater. Today Nano 5 100028
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[8] Veldhuis S A, Boix P P, Yantara N, Li M, Sum T C, Mathews N, Mhaisalkar S G 2016 Adv. Mater. 28 6804
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[9] Park M H, Park J, Lee J, So H S, Kim H, Jeong S H, Han T H, Wolf C, Lee H, Yoo S, Lee T W 2019 Adv. Funct. Mater. 29 1902017
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[10] Fang Z B, Chen W J, Shi Y L, Zhao J, Chu S L, Zhang J, Xiao Z G 2020 Adv. Funct. Mater. 30 1909754
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[11] Cao Y, Wang N N, Tian H, Guo J S, Wei Y Q, Chen H, Miao Y F, Zou W, Pan K, He Y R, Cao H, Ke Y, Xu M M, Wang Y, Yang M, Du K, Fu Z, Kong D C, Dai D X, Jin Y Z, Li G Q, Li H, Peng Q M, Wang J P, Huang W 2018 Nature 562 249
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[12] Shen Y, Cheng L P, Li Y Q, Li W, Chen J D, Lee S T, Tang J X 2019 Adv. Mater. 31 1901517
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[15] Zhao X F, Tan Z K 2019 Nat. Photonics 4851 50
[16] Xu W D, Hu Q, Bai S, Bao C X, Miao Y F, Yuan Z C, Borzda T, Barker A J, Tyukalova E, Hu Z J, Kawecki M, Wang H Y, Yan Z B, Liu X J, Shi X B, Uvdal K, Fahlman M, Zhang W J, Duchamp M, Liu J M, Petrozza A, Wang J P, Liu L M, Huang W, Gao F 2019 Nat. Photonics 13 418
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Fang X M, Jiang X W, Zhao J W 2018 Laser Optoelectronics Progress 55 082302
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[19] Hong K, Lee J L 2011 Electron. Mater. Lett. 7 77
Google Scholar
[20] Meng S S, Li Y Q, Tang J X 2018 Org. Electron. 61 351
Google Scholar
[21] 李国龙, 黄卓寅, 李衎, 甄红宇, 沈伟东, 刘旭 2011 60 077207
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Li G L, Huang Z Y, Li K, Zhen H Y, Shen W D, Liu X 2011 Acta. Phys. Sin. 60 077207
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[22] Hsu C W, Lee Y C, Chen H L, Chou Y F 2012 Photonic. Nanostruct. 10 523
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[23] Gao C H, Zhang Y, Ma X J, Yu F X, Jia Y L, Lei Y L, Chen P, Sun W W, Xiong Z H 2018 Org. Electron. 58 88
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[24] Zhou Y, Wu G M, Gao D W, Xing G J, Zhu Y Y, Zhang Z Q, Cao Y 2012 Adv. Mat. Res. 465 268
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[25] Seo H K, Kim H, Lee J, Park M H, Jeong S H, Kim Y H, Kwon S J, Han T H, Yoo S, Lee T W 2017 Adv. Mater. 29 1605587
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Google Scholar
[36] Mao J, Sha W E I, Zhang H, Ren X G, Zhuang J Q, Roy V A L, Wong K S, Choy W C H 2017 Adv. Funct. Mater. 27 1606525
Google Scholar
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[39] Zhao L F, Lee K M, Roh K D, Khan S U Z, Rand B P 2019 Adv. Mater. 31 1805836
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Google Scholar
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