The Improvement of Efficiency and Lifetime for Organic Light-emitting Devices by Using a High Tg and Heat-resistant Hole Injection Material
A novel fluoreoe derivative ( LT-N121) 9, 9-Bis 4-di (naphth-2-yl) amlnophenyl fluorene with high Tg (Tg = 165.9℃), and heat-resistant(weight loss ＜0. 5％ at 490℃) was evaluated as hole injection material. A blue emitting layer as a standard device: ITO/ hole injection layer(60 nm) / NPB(15 nm) / DPVBi: 2％ BCzVBi(30 nm) / Alq3 (20 nm)/ LiF/ Al was demonstrated for the comparison of different hole injection material (including m-MTDATA, NPB, Hexanilrile hexaazatriphenylene (HAT), Merck-TMM016 and LT-N121). The half-lifetime of LT-N121 (initiate luminance of 100 cd/m2 at 85℃, power on) is 187 hr better than m-MTDATA (110 hr), NPB (95 hr), HAT (44 hr) and is close to Merck-TMM016 (1％ hr). The current efficiency was measured at the brightness of 500 cd/m2. LT-N121 (7.23cd/Aat6.2 V) is also higher than others, m-MTDATA(5.00 cd/A at 7.5 V), NPB(4.27 cd/A at 6.1 V), HAT(2.52 cd/A at 4.9 V), Merck-TMM016(5.39 cd/A at 5.9 V). The HOMO / LUMO of LT-N121 was investigated here and compared to others.
Hole Injection Material Blue Emitting Layer Organic Light-emitting Device
Feng-wen Yen Chao-yu Chiu Cheng-hao Chang
Luminescence Technology Corp., 2F, No.21 R &D Road II, Science-Based Industrial Park, Hsin-Chu 30076, Taiwan, China
国际会议
上海
英文
1401-1405
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）