Highly efficient blue OLEDs based on diphenylaminofluorenylstyrenes end-capped with heterocyclic aromatics

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2012.04.055· OSTI ID:22215498

Oh, Suhyun ^[1]; Lee, Kum Hee; Kim, Young Kwan ^[2]

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1. Department of Chemistry, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
2. Department of Information Display, Hongik University, Seoul 121-791 (Korea, Republic of)

In this paper, we have designed four diphenylaminofluorenylstyrene derivatives end-capped with heterocyclic aromatic groups, such as 9-phenylcabazole, 4-dibenzofuran, 2-benzoxazole, 2-quinoxaline, respectively. These materials showed blue to red fluorescence with maximum emission wavelengths of 476–611 nm, respectively, which were dependent on the structural and electronic nature of end-capping groups. To explore the electroluminescent properties of these materials, multilayer OLEDs were fabricated in the following sequence: ITO/DNTPD (40 nm)/NPB (20 nm)/2% doped in MADN (20 nm)/Alq{sub 3} (40 nm)/Liq. (1 nm)/Al. Among those, a device exhibited a highly efficient blue emission with the maximum luminance of 14,480 cd/m{sup 2} at 9 V, the luminous efficiency of 5.38 cd/A at 20 mA/cm{sup 2}, power efficiency of 2.77 lm/W at 20 mA/cm{sup 2}, and CIE{sub x,y} coordinates of (0.147, 0.152) at 8 V, respectively.

• OSTI ID: 22215498
• Journal Information: Materials Research Bulletin, Vol. 47, Issue 10; Conference: IFFM2011: 2011 international forum on functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011, AFM-2: 2. special symposium on advances in functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DOPED MATERIALS
EFFICIENCY
FLUORESCENCE
LAYERS
LIGHT EMITTING DIODES
NUCLEAR MAGNETIC RESONANCE
SYNTHESIS