CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High-Efficiency Green Phosphorescent Organic Light-Emitting Diode Based on Simplified Device Structures |
ZHANG Hong-Mei1,2**, WANG Dan-Bei1, ZENG Wen-Jin1,2, YAN Min-Nan1 |
1Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023
2Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023 |
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Cite this article: |
ZHANG Hong-Mei, WANG Dan-Bei, ZENG Wen-Jin et al 2015 Chin. Phys. Lett. 32 097803 |
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Abstract A high-efficiency green phosphorescent organic light emitting diode with a simplified structure is achieved that is free of a hole transport layer. The design of this kind of device structure not only saves the consumption of organic materials but also greatly reduces the structural heterogeneities and effectively facilitates the charge injection into the emissive layer. The resulting green phosphorescent organic light-emitting diodes (PHOLEDs) exhibit higher electroluminescent efficiency. The maximum external quantum efficiency and current efficiency reach 23.7% and 88 cd/A, respectively. Moreover the device demonstrates satisfactory stability, keeping 23.7% and 88 cd/A, 22% and 82 cd/A, respectively, at a luminance of 100 and 1000 cd/m2. The working mechanism for achieving high efficiency based on such a simple device structure is discussed correspondingly. The improved charge carrier injection and transport balance are proved to prominently contribute to achieve the high efficiency and great stability at high luminance in the green PHOLEDs.
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Received: 18 April 2015
Published: 02 October 2015
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PACS: |
78.60.Fi
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(Electroluminescence)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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[1] Kido J, Kimura M and Nagai K 1995 Science 267 1332
[2] Shen Z, Burrows P E, Bulovic V, Forrest S R and Thompson M E 1997 Science 276 2009
[3] Forrest S R 2004 Nature 428 911
[4] Zhang Z Q, Wang Q, Dai Y F, Liu Y P, Wang L X and Ma D G 2009 Org. Electron. 10 491
[5] Baldo M A, O'Brien D F, You Y et al 1998 Nature 395 1
[6] Reineke S, Rosenow T C, Lüssem B and Leo K 2010 Adv. Mater. 22 3189
[7] Su S J, Sasabe H, Pu Y J, Nakayama K I and Kido J 2010 Adv. Mater. 22 3311
[8] Wang Z B et al 2011 Appl. Phys. Lett. 98 073310
[9] Reineke S, Walzer K and Leo K 2007 Phys. Rev. B 75 125328
[10] Giebink N C and Forrest S R 2008 Phys. Rev. B 77 235215
[11] Walzer K, Maennig B, Pfeiffer M and Leo K 2007 Chem. Rev. 107 1233
[12] Choudhury K R, Yoon J and So F 2008 Adv. Mater. 20 1456
[13] Tanaka D et al 2007 Jpn. J. Appl. Phys. 46 L117
[14] Kim S H, Jang J and Lee J Y 2007 Appl. Phys. Lett. 90 223505
[15] Tsang S W, Lu Z H and Tao Y 2007 Appl. Phys. Lett. 90 132115
Fukagawa H et al 2007 Adv. Mater. 19 665
[16] Feng J et al 2001 Appl. Phys. Lett. 78 3947
Liu Y, Guo J H, Zhang H D and Wang Y 2002 Angew. Chem. Int. Ed. 41 182
Kalinowski J, Cocchi M, Virgili D and Fattori V 2007 Adv. Mater. 19 4000
[17] Fadhel O et al 2009 Adv. Mater. 21 1261
[18] Jeon W S et al 2008 Appl. Phys. Lett. 93 063303
[19] Meyer J et al 2007 Appl. Phys. Lett. 91 113506
[20] Liu Z W, Helander M G, Wang Z B and Lu Z H 2009 Appl. Phys. Lett. 94 113305
[21] Zeng W J, Bi R, Zhang H M and Huang W 2014 J. Appl. Phys. 116 224502
[22] Liu Z, Helander M G, Wang Z and Lu Z 2009 Org. Electron. 10 1146
[23] Dijken A V, Perro A, Meulenkamp E A and Brunner K 2003 Org. Electron. 4 131
Mezyk J, Meinardi F, Tubino R and Cocchi M 2008 Appl. Phys. Lett. 93 093301
[24] Baldo M A, Lamansky S, Burrows P E and Forrest S R 1999 Appl. Phys. Lett. 75 4
[25] Cai M et al 2012 Adv. Mater. 24 4337
[26] Long L, Shang Y Z, Lv Y F, Yu J N and Wei B 2011 Int. Conf. Electron. Optoelectron. 4 96
[27] He G, Pfeiffer M and Leo K 2004 Appl. Phys. Lett. 85 3911
[28] Hudson Z M, Wang Z B, Helander M G, Lu Z H and Wang S N 2012 Adv. Mater. 24 2922
[29] Chin B D 2011 J. Phys. D: Appl. Phys. 44 115103
[30] Chao T, Bi R, Tao Y T, Wang F F, Cao X D, Wang S F Tao J, Cheng Z, Zhang H M and Huang W 2015 Chem. Commun. 51 1650
[31] Lu F P, Li J F and Sun S J 2013 Acta Phys. Sin. 62 247201 (in Chinese) |
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