Highly color-stability flexible white organic light-emitting devices fabricated by color conversion method

Wu Xiao-Ming; Shen Li-Ying; Hua Yu-Lin; Dong Mu-Sen; Mu Xue; Bai Juan-Juan; Bi Wen-Tao; Yang Xiao-Yan; Yin Shou-Gen

doi:10.7498/aps.61.178502

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

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).

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[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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Vol. 61, Issue 17 - 2012-09-05

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