利用色彩转换法制备高色稳定性的柔性白色有机电致发光器件

吴晓明; 申利莹; 华玉林; 董木森; 穆雪; 白娟娟; 毕文涛; 杨小艳; 印寿根

doi:10.7498/aps.61.178502

摘要

本文利用色转换方法,将高效的蓝色柔性有机电致发光器件(flexible organic light emitting devices, FOLEDs)与色转换材料(color conversion material, CCM)相结合,制备了柔性白色有机电致发光器件(white organic light emitting devices, WOLEDs).首先利用2, 3, 5, 6-Tetrafluoro-7, 7, 8, 8-tetracyano-quinodimethane (F4-TCNQ)和4, 4', 4"-tris-(N-3-methylphenyl-N-phenylamino) tripheny-lamine (m-MTDATA)组成的多量子阱(multiple quantum well, MQW)结构作为空穴注入层(hole injection layer, HIL)结合新型蓝光材料N6, N6, N12, N12-tetrap-tolylchrysene-6, 12-diamine (NCA)制备出高效的蓝光FOLEDs,然后将其与色转换材料4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) 结合,通过沉积不同厚度的CCM来优化白光器件的发光光谱,获得了色稳定性较高的白光. 实验结果表明:在驱动电压为7 V, DCJTB的厚度为120 nm时得到较接近白光等能点的色坐标 (0.33, 0.27),且当驱动电压由6 V升至11 V 时,器件的色坐标变化仅为(±0.02, ±0.02), 表现出高色稳定性.

关键词:

Abstract

We demonstrate flexible white organic light-emitting diode (WOLED) with high color stability, which combines vacuum deposited blue flexible organic light-emitting diode (FOLED) with red surface color conversion material (CCM). Firstly, we utilize the novel multiple quantum well (MQW), which consists of the alternate layers of 2, 3, 5, 6-Tetrafluoro-7, 7, 8, 8-tetracyano-quinodimethane (F4-TCNQ) and 4, 4', 4"-tris-(N-3-methylphenyl-N-phenylamino) tripheny-lamine (m-MTDATA) as hole injection layer (HIL), through combining a new blue emitting material of N6, N6, N12, N12-tetrap-tolylchrysene-6, 12-diamine (NCA), to fabricate highly efficient blue FOLED. Then, the CCM of 4-(dicyanomethylene)-2-tert-butyl-6-(1, 1, 7, 7-tetramethyljul-oli-dyl-9-en-yl)-4H-pyran (DCJTB) is deposited on the outside of the ITO flexible substrate. Finally, the thickness of the color conversion film (CCF) is optimized to improve the color purity of flexible WOLED. The results demonstrate that at a driving voltage of 7 V, the CIE coordinates of (0.33, 0.27) which are very close to the white equal-energy area are obtained with the thickness of DCJTB of 120 nm. Moreover, the CIE coordinate migrations of the flexible WOLED are less than (±0.02, ±0.02) in a wide range of driving voltages (from 6 V to 11 V) for the device, indicating the flexible WOLED has excellent color stability.

Keywords:

flexible white organic light-emitting devices /
color conversion material /
color stability

作者及机构信息

1.
天津理工大学材料科学与工程学院, 显示材料与光电器件教育部重点实验室, 天津市光电显示材料与器件重点实验室, 天津 300384

基金项目: 国家自然科学基金(批准号: 60906022, 60876046);天津市自然科学基金(批准号: 10JCYBJC01100)和天津市高等学校科技发展基金计划重点项目(批准号: 2011ZD02)资助的课题.

Authors and contacts

1.
School of Materials Science and Engineering, Tianjin University of Technology, Key Laboratory of Display Materials and Photoelectric devices (Ministry of Education), Tianjin Key Laboratory of Photoelectric Materials and devices, Tianjin 300384, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022, 60876046), the Natural Science Foundation of Tianjin, China (Grant No. 10JCYBJC01100), and the Scientific Developing Foundation of Tianjin Education Commission (Grant No. 2011ZD02).

参考文献

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施引文献

[1]	Tang C W, Vanslyke S A 1987 Appl. Phys. Lett. 51 913
[2]	Kulkarni A P, Kong X X, Jenekhe S A 2006 Adv. Funct. Mater. 16 1057
[3]	Cao J, Liu X, Zhang X B, Wei F X, Zhu W Q, Jiang X Y, Zhang Z L, Xu S H 2007 Acta Phys. Sin. 56 1088 (in Chinese) [曹进, 刘向, 张晓波, 委福祥, 朱文清, 蒋雪茵, 张志林, 许少鸿 2007 56 1088]
[4]	Xiong Y, Xu W, Li C, Liang B, Zhao L, Peng J B, Cao Y, Wang J 2008 Org. Electron. 9 533
[5]	Ma J, Piao X C, Liu J, Zhang L T, Zhang T Y, Liu M, Li T, Xie W F, Cui H N 2011 Org. Electron. 12 923
[6]	Wang X P, Mi B X, Gao Z Q, Guo Q, Huang W 2011 Acta Phys. Sin. 60 087808 (in Chinese) [王旭鹏, 密保秀, 高志强, 郭晴, 黄维 2011 60 087808]
[7]	Logothetidis S 2008 Mater. Sci. Eng. B 152 96
[8]	Park J S, Kim T W, Stryakhilev D, Lee J S, An S G, Pyo Y S, Lee D B, Mo Y G, Jin D U, Chung H K 2009 Appl. Phys. Lett. 95 013503
[9]	Tsuboi T J 2010 J. Non-cryst. Solids. 356 1919
[10]	Wang Y, Hua Y L, Wu X M, Zhang L J, Hou Q C, Liu Q 2008 Org. Electron. 9 273
[11]	Benjamin C, Krummacher, Vi-En C, Mathew K, Mathai, Stelios A, Choulis, Franky S 2006 Appl. Phys. Lett. 88 113506
[12]	Li C, Kimura H, Saito T, Sakurai K, Wei B, Ichikawa M, Taniguchi Y 2007 Opt. Express 15 14422
[13]	Ji W Y, Zhang L T, Gao R X, Zhang L M, Xie W F, Zhang H Z, Li B 2008 Opt. Express 16 15489
[14]	Chen S M, Kwok H S 2011 Org. Electron. 12 677
[15]	Zhu W Q, Wang Q, Li B, Zhang X W, Lu L, Wei B, Zhang J H, Li C 2010 J. Phys. D: Appl. Phys. 43 205102
[16]	Chen S, Li X, Huang W 2008 Org. Electron. 9 1112
[17]	Wang J, Zhao Y, Xie W F, Duan Y, Chen P, Liu S Y 2011 Acta Phys. Sin. 60 107203 (in Chinese ) [汪津, 赵毅, 谢文法, 段羽, 陈平, 刘式墉 2011 60 107203]
[18]	Zheng T H, Choy W C H 2010 Thin Solid Films 519 872
[19]	Zhang Z Q, Wang Q, Dai Y F, Liu Y P, Wang L X, Ma D G 2009 Org. Electron. 10 491
[20]	Li T L, Li W L, Li X, Chu B, Su Z S, Han L L, Chen Y R, Hu Z Z, Zhang Z Q 2010 J. Lumin. 130 1676
[21]	Xu D H, Li X, Ju H L, Zhu Y H, Deng Z B 2011 Displays 32 92
[22]	Yuan Y B, Li S, Wang Z, Xu H T, Zhou X 2009 Opt. Express 17 1577
[23]	Baek S H, Kim C U, Choo D C, Kim T W, Park J H, Seo J H, Kim Y K 2009 Mol. Cryst. Liq. Cryst. 498 258
[24]	Wang L, Xu W, Luo Y, Yuan J W, Ding Y C 2011 Displays 32 45
[25]	Zhu H N, Xu Z, Zhao S L, Zhang F J, Kong C, Yan G, Gong W 2010 Acta Phys. Sin. 59 8093 (in Chinese) [朱海娜, 徐征, 赵谡玲, 张福俊, 孔超, 闫光, 龚伟 2010 59 8093]

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