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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 8
BKCSDE 34(8)
August 20, 2013 

Blue Organic Light-Emitting Diodes Based on Triphenylene Derivatives
Seul Ong Kim, Heung Soo Jang, Seok Jae Lee, Young Kwan Kim*, Seung Soo Yoon*
OLED, Blue fluorescence, Triphenylene derivatives
A series of blue fluorescent emitters based on triphenylene derivatives were synthesized via the Diels -Alder reaction in moderate yields. The electronic absorption and emission characteristics of the new functional materials were affected by the nature of the substituent on the triphenylene nucleus. Multilayered OLEDs were fabricated with a device structure of: ITO/NPB (50 nm)/EML (30 nm)/Bphen (30 nm)/Liq (2.0 nm)/Al (100 nm). All devices showed efficient blue emissions. Among those, a device using 1 gives the best performances with a high brightness (978 cd m−2 at 8.0 V) and high efficiencies (a luminous efficiency of 0.80 cd/A, a power efficiency of 0.34 lm/W and an external quantum efficiency of 0.73% at 20 mA/cm2). The peak wavelength of the electroluminescence was 455 nm with CIEx,y coordinates of (0.17, 0.14) at 8.0 V.
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