Indenofluorene-Based Blue Fluorescent Compounds and Their Application in Highly Efficient Organic Light-Emitting Diodes
Blue fluorescent compounds based on indenofluorene derivatives incorporating the (diphenylamino)arylvinyl group and di‐tert‐butylphenyl blocking units have been synthesized by Suzuki coupling and the Horner–Wadsworth–Emmons reaction. Their electroluminescence in multilayered OLEDs was examined; the...
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Published in | European journal of organic chemistry Vol. 2012; no. 14; pp. 2748 - 2755 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.05.2012
WILEY‐VCH Verlag Wiley Wiley-VCH |
Subjects | |
Online Access | Get full text |
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Summary: | Blue fluorescent compounds based on indenofluorene derivatives incorporating the (diphenylamino)arylvinyl group and di‐tert‐butylphenyl blocking units have been synthesized by Suzuki coupling and the Horner–Wadsworth–Emmons reaction. Their electroluminescence in multilayered OLEDs was examined; the devices have the structures ITO/DNTPD/NPB/MADN:blue dopant/Alq3/LiF/Al. A device with 7 % 2‐(3,5‐di‐tert‐butylphenyl)‐8‐(9,9‐diethyl‐2‐(diphenylamino)fluoren‐7‐ylethenyl)‐6,6,12,12‐tetraethylindeno[1,2‐b]fluorene (3) as blue dopant showed a luminous efficiency of 12.2 cd A–1, a power efficiency of 6.08 lm W–1, and an external quantum efficiency of 7.84 % at 20 mA cm–1 with CIE (Commission Internationale d'Énclairage) (x, y) coordinates of (0.148, 0.241) at 8.5 V. A deep‐blue OLED with CIE (x, y) coordinates of (0.153, 0.128) doped with 2‐(3,5‐di‐tert‐butylphenyl)‐8‐[9‐(3,5‐di‐tert‐butylphenyl)carbazol‐3‐ylethenyl]‐6,6,12,12‐tetraethylindeno[1,2‐b]fluorene (4) exhibited a luminous efficiency of 3.25 cd A–1, a power efficiency of 1.74 lm W–1, and an external quantum efficiency of 2.93 % at 20 mA cm–1.
A series of indenofluorene derivatives incorporating the (diphenylamino)arylvinyl group and di‐tert‐butylphenyl blocking units have been synthesized and their photophysical and electroluminescent properties examined. In the case of device 3C, the use of 3 as dopant in the emitting layer led to blue emission with an external quantum efficiency of 7.8 % at 20 mA cm–1. |
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Bibliography: | Korean Ministry of Education, Science and Technology, National Research Foundation (NRF) - No. 20110004655 ArticleID:EJOC201200117 istex:F487E4C767629E068F0524FC26191A2FCCFC763B Gyeonggi Province Ministry of Knowledge and Economy (MKE) ark:/67375/WNG-N96PWF4P-3 |
ISSN: | 1434-193X 1099-0690 |
DOI: | 10.1002/ejoc.201200117 |