標題: Efficient green organic light-emitting diodes with stericly hindered coumarin dopants
作者: Chen, CH
Tang, CW
友訊交大聯合研發中心
D Link NCTU Joint Res Ctr
公開日期: 26-Nov-2001
摘要: We have discovered two stericly hindered green coumarin derivatives which showed significantly better thermal stability and overall electroluminescence (EL) performance than those of the corresponding 3-(2-benzothiazolyl)-7-(diethylamino)-2H-1-benzopyran-2-one (C-6) and 10-(2-benzothiazolyl)-1,1,7,7-tetramethyl- 2,3,6,7-tetrahydro-1H,5H,11H-benzo[l]pyrano[6,7, 8-ij] quinolizin-11-one (C-545T). The strategic incorporation of bulky spacer t-butyl groups in these dopants considerably delays the onset of concentration quenching. In particular, 10-[2(5,7-di-t-butyl)benzothiazolyl]-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-benzo-[l]pyrano[6,7,8-ij]quinolizin-11-one (C-545TB) with its superb thermal stability (T-g=142 degreesC; T-d=327 degreesC), high luminance efficiency (similar to 13 cd/A), good Commission Interationale d'Eclairage (CIE) coordinates (x=0.30; y=0.64) and a nearly flat EL efficiency dependence on drive current stands out as one of the best choice of green dopants for use in the passive-matrix organic light-emitting diode displays. (C) 2001 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.1420583
http://hdl.handle.net/11536/29240
ISSN: 0003-6951
DOI: 10.1063/1.1420583
期刊: APPLIED PHYSICS LETTERS
Volume: 79
Issue: 22
起始頁: 3711
結束頁: 3713
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