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Proceedings Paper

Light-emitting carbazole derivatives for electroluminescent materials
Author(s): Jiann T'suen Lin; K. R. Justin Thomas; Yu-Tai Tao; Chung-Wen Ko
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Paper Abstract

Amorphous carbazole derivatives containing peripheral diarylamines at the 3- and 6-positions and an ethyl or aryl substituent at the 9-position of the carbazole moiety have been synthesized. These new carbazole compounds (carbs) possess high glass transition temperatures (Tg: 120- 194 degree(s)C) and high thermal decomposition temperatures (Td>450 degree(s)C). The compounds are weakly to moderately luminescent with the emission wavelength ranging from green to blue. Two types of light-emitting diodes (LED) were constructed from carb:(I)ITO/carb/TPBI/Mg:Ag and (II)ITO/carb/Alq3/Mg:Ag, where TPBI and Alq3 are 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene and tris(8- hydroxyquinoline) aluminum, respectively. In type I devices the carb functions as the hole-transporting as well as emitting material. In type II devices either carb and/or Alq3 is the light emitting material. Several green light-emitting devices exhibit exceptional maximum brightness and the physical performance is superior to those of typical green-light-emitting devices of the structure ITO/diamine/Alq3/Mg:Ag. Relation between the LUMO of the carb and the performance of the light-emitting diode is discussed.

Paper Details

Date Published: 27 February 2002
PDF: 10 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457490
Show Author Affiliations
Jiann T'suen Lin, Institute of Chemistry/Academia Sinica (Taiwan)
K. R. Justin Thomas, Institute of Chemistry/Academia Sinica (Taiwan)
Yu-Tai Tao, Institute of Chemistry/Academia Sinica (Taiwan)
Chung-Wen Ko, Institute of Chemistry/Academia Sinica (Taiwan)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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