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: | 26-十一月-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 |
顯示於類別: | 期刊論文 |