中间层对三原色白光OLED的影响
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摘要
基于ITO/NPB/TCTA/Ir(MDQ)2(acac)∶TCTA/FIrpic∶TmPyPb/Ir(ppy)3∶TmPyPb/TmPyPb/LiF/Al结构的三原色白光器件,通过分别在蓝光与红光、绿光发光层界面处插入2nmTCTA与2nmTmPyPb中间层,研究了中间层的有无对器件性能的影响。结果表明,中间层的引入可以调整激子的分布,影响能量转移。具有双中间层的器件实现了高质量的白光发射,最大发光效率达到22.56cd/A。
The effects of the interlayer on the white organic light-emitting diodes(WOLEDs) was studied by inserting the 2 nm TCTA and 2 nm TmPyPb interlayer into the interface between different emission layers respectively based on the structure of ITO/NPB/TCTA/Ir(MDQ)2(acac) ∶ TCTA/FIrpic∶ TmPyPb/Ir(ppy)3∶ TmPyPb/TmPyPb/LiF/Al. The results show that the distribution of exciton and energy transfer can be adjusted and influenced because of the existence of interlayer. The peak efficiency of the high quality WOLEDs with two interlayers is 22. 56 cd/A.
The effects of the interlayer on the white organic light-emitting diodes(WOLEDs) was studied by inserting the 2 nm TCTA and 2 nm TmPyPb interlayer into the interface between different emission layers respectively based on the structure of ITO/NPB/TCTA/Ir(MDQ)2(acac) ∶ TCTA/FIrpic∶ TmPyPb/Ir(ppy)3∶ TmPyPb/TmPyPb/LiF/Al. The results show that the distribution of exciton and energy transfer can be adjusted and influenced because of the existence of interlayer. The peak efficiency of the high quality WOLEDs with two interlayers is 22. 56 cd/A.
引文
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[5]胡俊涛,宗艳凤,邓亚飞,等.溶液法制备Sim CP∶FIrpic掺杂的蓝色磷光器件[J].液晶与显示,2015,30(2):240-245.HU J T,ZONG Y F,DENG Y F,et al..Solution processible Sim CP:FIrpic doped blue phosphorescent devices[J].Chin.J.Liq.Cryst.Disp.,2015,30(2):240-245.(in Chinese)
[6]RAUPP S M,MERKLEIN L,PATHAK M,et al..An experimental study on the reproducibility of different multilayer OLED materials processed by slot die coating[J].Chem.Eng.Sci.,2017,160(160):113-120.
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[8]WANG K,GAO Z,MIAO Y,et al..Improved color stability of complementary WOLED with symmetrical doped phosphors in single host:experimental verification and mechanism analysis[J].RSC Adv.,2017,7(54):33782-33788.
[9]LI X L,XIE G,LIU M,et al..High-efficiency WOLEDs with high color-rendering index based on a chromaticity-adjustable yellow thermally activated delayed fluorescence emitter[J].Adv.Mater.,2016,28(23):4614-4619.
[10]WU Z,YU L,ZHOU X,et al..Management of singlet and triplet excitons:a universal approach to high-efficiency all fluorescent WOLEDs with reduced efficiency roll-off using a conventional fluorescent emitter[J].Adv.Opt.Mater.,2016,4(7):1067-1074.
[11]HENWOOD A F,BANSAL A K,CORDES D B,et al..Solubilised bright blue-emitting iridium complexes for solution processed OLEDs[J].J.Mater.Chem.C,2016,4(17):3726-3737.
[12]KIDO J,HONGAWA K,OKUYAMA K,et al..White light-emitting organic electroluminescent devices using the poly(Nvinylcarbazole)emitter layer doped with three fluorescent dyes[J].Appl.Phys.Lett.,1994,64(7):815-817.
[13]LEI G,WANG L,QIU Y.Blue phosphorescent dye as sensitizer and emitter for white organic light-emitting diodes[J].Appl.Phys.Lett.,2004,85(22):5403-5405.
[14]GAO C H,SHI X B,ZHOU D Y,et al..Highly efficient white organic light-emitting diodes with controllable excitons behavior by a mixed interlayer between fluorescence blue and phosphorescence yellow-emitting layers[J].Int.J.Photoenergy,2013,2013(2):110-119.
[15]SUN Y,FORREST S R.High-efficiency white organic light emitting devices with three separate phosphorescent emission layers[J].Appl.Phys.Lett.,2007,91(26):197-199.
[16]REINEKE S,LINDNER F,SCHWARTZ G,et al..White organic light-emitting diodes with fluorescent tube efficiency[J].Nature,2009,459(7244):234-241.
[17]SONG D,ZHAO S,LUO Y,et al..Causes of efficiency roll-off in phosphorescent organic light emitting devices:triplettriplet annihilation versus triplet-polaron quenching[J].Appl.Phys.Lett.,2010,97(24):268-270.
[18]SCHWARTZ G,FEHSE K,PFEIFFER M,et al..Highly efficient white organic light emitting diodes comprising an interlayer to separate fluorescent and phosphorescent regions[J].Appl.Phys.Lett.,2006,89(8):083509-1-3.
[19]KAWAMURA Y,BROOKS J,BROWN J J,et al..Intermolecular interaction and a concentration-quenching mechanism of phosphorescent Ir(III)complexes in a solid film[J].Phys.Rev.Lett.,2006,96(1):017404.
[20]REINEKE S,SCHWARTZ G,WALZERK,et al..Reduced efficiency roll-off in phosphorescent organic light emittingdiodes by suppression of triplet-triplet annihilation[J].Appl.Phys.Lett.,2007,91(12):123508-1-3.
[21]BALDO M A,O'BRIEN D F,THOMPSONM E,et al..Excitonic singlet-triplet ratio in a semiconducting organic thin film[J].Phys.Rev.B,1999,60(20):14422-14428.
[22]O’BRIEN D,BALDO M,THOMPSON M,et al..Improved energy transfer in electrophosphorescent devices[J].Appl.Phys.Lett.,1999,74(3):442-444.