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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 10
BKCSDE 26(10)
October 20, 2005 

Synthesis of 5,6-Dihydro[1,10]phenanthroline Derivatives and Their Properties as Hole-Blocking Layer Materials for Phosphorescent Organic Light-Emitting Diodes
Hyo Won Lee*, Jung-Gi An, Hee-Kyoon Yoon, Hyosook Jang, Nam Gwang Kim, Youngkyu Do*
BCP derivatives, 5,6-Dihydro-2,9-diisopropyl-4,7-diaryl[1,10]phenanthroline, Hole-blocking materials, Phosphorescent organic light-emitting diode
To develop new hole-blocking materials for phosphorescent organic light-emitting diodes (PhOLEDs), 5,6- dihydro-2,9-diisopropyl-4,7-diphenyl[1,10]phenanthroline (1) and 5,6-dihydro-2,9-diisopropyl-4-(4-methoxyphenyl)- 7-phenyl[1,10]phenanthroline (2) were synthesized. While the absorption spectrum of 1 is very similar to that of 2, the photoluminescence spectrum of 1 has the feature of the narrower and blue-shifted blueviolet emission at the peak of 356 nm compared to that of 2. The HOMO and LUMO energy levels of 1 and 2 were estimated from the measurement of cyclic voltammetry, and 1 has the appropriate levels for a holeblocking layer (HBL). The use of 1 as a HBL in a green PhOLED led to good efficiency of 23.6 cd/A at 4.4 mA/cm2.
1569 - 1574
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