Light-emitting carbazole derivatives for electroluminescent materials

Jiann T'suen Lin; K. R. Justin Thomas; Yu-Tai Tao; Chung-Wen Ko

doi:10.1117/12.457490

27 February 2002 Light-emitting carbazole derivatives for electroluminescent materials

Jiann T'suen Lin, K. R. Justin Thomas, Yu-Tai Tao, Chung-Wen Ko

Proceedings Volume 4464, Organic Light-Emitting Materials and Devices V; (2002) https://doi.org/10.1117/12.457490
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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 (T_g: 120- 194 degree(s)C) and high thermal decomposition temperatures (T_d>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.

Citation Download Citation

Jiann T'suen Lin, K. R. Justin Thomas, Yu-Tai Tao, and Chung-Wen Ko "Light-emitting carbazole derivatives for electroluminescent materials", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457490

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