Synthesis of 5,6-dihydro[1,10]phenanthroline derivatives and their properties as hole-blocking layer materials for phosphorescent organic light-emitting diodes

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 I is very similar to that of 2, the photoluminescence spectrum of 1 has the feature of the narrower and blue-shifted blue-violet emission at the peak of 356 rim, compared to that of 2. The HOMO and LUMO energy levels of 1 and 2 were estimated from the measurement of cyclic voltanimetry, and 1 has the appropriate levels for a hole-blocking 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/cm(2)..
Publisher
KOREAN CHEMICAL SOC
Issue Date
2005-10
Language
ENG
Keywords

ELECTROLUMINESCENT DEVICES; FLUOROPHORES; EMISSION; FAMILY

Citation

BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.26, no.10, pp.1569 - 1574

ISSN
0253-2964
URI
http://hdl.handle.net/10203/3273
Appears in Collection
CH-Journal Papers(저널논문)
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