Efficient white polymeric light-emitting diodes by doping ionic iridium complex

Zhao Bao-Feng; Tang Huai-Jun; Yu Lei; Wang Bao-Zheng; Wen Shang-Sheng

doi:10.7498/aps.60.088502

Abstract

A series of white polymer light-emitting diodes (WPLEDs) each with a single emitting layer using ionic iridium complex is fabricated. The white light is obtained via two complementary colors of orange light emitter ionic iridium complexe PF6 (Hnpy: 2-(naphthalen-1-yl)pyridine, c-phen: 1-ethyl-2-(9-(2-ethylhexyl)-9H-carbazol-3-yl)-1H-imidazo phenanthroline) and sky-blue light emitter Firpic (iridium bis(2-(4,6-difluorophenyl)-pyridinato-N,C(2)) picolinate. The emtting layer consists of poly(N-vinylcarbzole) (PVK) as host polymer, 1,3-bis -phenylene (OXD-7) as electron-transporting materials, Firpic and PF6. The structure of the WPLED is indium-tin-oxide/poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate)(40 nm)/emtting layer (80 nm)/CsF(1.5 nm)/Al(120 nm). When the mass ratio of PVK, OXD-7, Firpic, PF6 is 67 ∶23 ∶10 ∶0.25, the most efficient white light is obtained with a color coordinate of (0.31,0.40), a maximal luminance efficiency of 13.3 cd/A and a maximal luminance of 6032 cd/m2. Meanwhile, the color coordinate is unchanged with current density. The mechanism of the WPLED is discussed.

Keywords:

Authors and contacts

1.
Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China;
2.
Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology of Ministry of Education, South China University of Technology, Guangzhou 510640, China

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Cited By

[1]	Tang C W, Vanslyke S A 1987 Appl. Phys. Lett. 51 913
[2]
[3]	Burroughes J H, Bradley D D C, Brown A R, Marks R N, Mackay K, Friend R H, Holmes A B 1990 Nature 347 539
[4]	Baldo M A, OBrien D F, You Y, Shoustikov A, Sibley S, Thompson M E, Forrest S R 1998 Nature 395 151
[5]
[6]	Wu H B, Huang F, Mo Y Q, Yang W, Peng J B, Cao Y 2004 Adv. Mater. 16 1826
[7]
[8]	Xu Y H, Peng J B, Mo Y Q, Hou Q, Cao Y 2005 Appl. Phys. Lett. 86 163502
[9]
[10]
[11]	Wang L, Liang B, Huang F, Peng J B, Cao Y 2006 Appl. Phys. Lett. 89 151115
[12]	Kim T H, Lee H K, Park O O, Chin B D, Lee S H, Kim J K 2006 Adv. Funct. Mater. 16 611
[13]
[14]	Hou L T, Huang F, Peng J B, Cao Y 2007 Acta Phys. Sin. 56 6104 (in Chinese) [侯林涛、黄飞、彭俊彪、曹镛 2007 物理学报 56 6104]
[15]
[16]	Zhang Y, Huang F, Chi Y, Jen A K Y 2008 Adv. Mater. 20 1565
[17]
[18]
[19]	Zhang B H, Qin C J, Ding J Q, Chen L, Xie Z Y, Cheng Y X, Wang L X 2010 Adv. Funct. Mater. 20 2951
[20]	Wu H B, Zhou G J, Zou J H, Ho C L, Wong W Y, Yang W, Peng J B, Cao Y 2009 Adv. Mater. 21 1
[21]
[22]	Huang W B, Zeng W J, Wang L, Peng J B 2008 Acta Phys. Sin. 57 5983 (in Chinese) [黄文波、曾文进、王藜、彭俊彪 2008 物理学报 57 5983]
[23]
[24]	Gu C, Fei T, L Y, Feng T, Xue S F, Lu D, Ma Y G 2010 Adv. Mater. 22 2702
[25]
[26]
[27]	Zou J H, Tao H, Wu H B, Peng J B 2009 Acta Phys. Sin. 58 1224 (in Chinese) [邹建华、陶洪、吴宏滨、彭俊彪 2009 物理学报 58 1224]
[28]
[29]	Wang B Z, Zhang A Q, Wu H B, Yang W, Wen S S 2010 Acta Phys. Sin. 59 4240 (in Chinese) [王保争、张安琪、吴宏滨、杨伟、文尚胜 2010 物理学报 59 4240]
[30]
[31]	Li Y H, Fang Y, Zou J H, Wang B, Wu H B, Peng J B 2010 Acta Phys. Chim. Sin. 26 2752 (in Chinese) [李艳虎、方园、邹建华、王彪、吴宏滨、彭俊彪 2010 物理化学学报 26 2752]
[32]	Niu Q L, Zhang Y, Fan G H 2009 Acta Phys. Sin. 58 8630 (in Chinese) [牛巧丽、章勇、范广涵 2009 物理学报 58 8630]
[33]
[34]	Reineke S, Lindner F, Schwartz G, Seidler N, Seidler N, Walzer K 2009 Nature 459 234
[35]
[36]
[37]	Wu H B, Zou J H, Liu F, Wang L, Mikhailovsky A, Bazan G C, Yang W, Cao Y 2008 Adv. Mater. 20 696
[38]
[39]	Ohta N, Robertson A 2006 Colorimetry: Fundamentals and Applications (New York: John Wiley Sons) p87
[40]	Su H C, Chen H F, Fang F C, Liu C C, Wu C C, Wong K T, Liu Y H, Peng S M 2008 J. Am. Chem. Soc. 130 3413
[41]
[42]	Mydlak M, Bizzarri C, Hartmann D, Sarfert W, Schmid G, De Cola L 2010 Adv. Funct. Mater. 20 1812
[43]
[44]
[45]	Costa R D, Ort E, Bolink H J, Graber S, Housecroft C E, Constable E C 2010 Adv. Funct. Mater. 20 1511
[46]	Wong W Y, Zhou G J, Yu X M, Kwok H S, Lin Z Y 2007 Adv. Funct. Mater. 17 315
[47]
[48]
[49]	He L, Duan L A, Qiao J A, Zhang D Q, Wang L D, Qiu Y 2010 Org. Electron. 11 1185
[50]
[51]	Noh Y Y, Lee C L, Kim J J, Yase K 2003 J. Chem. Phys. 118 2853
[52]
[53]	Chen F C, Chang S C, He G F, Pyo S, Yang Y, Kurotaki M, Kido J 2003 J. Polym. Sci. B 41 2681
[54]
[55]	Li A Y, Li Y Y, Cai W Z, Zhou G J, Chen Z, Wu H B, Wong W Y, Yang W, Peng J B, Cao Y 2010 Org. Electron. 11 529

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Vol. 60, Issue 8 - 2011-04-20

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