Trap states of tris-8-(hydroxyquinoline) aluminum and naphthyl-substituted benzidine derivative using thermally stimulated luminescence

被引:114
作者
Forsythe, EW [1 ]
Morton, DC
Tang, CW
Gao, YL
机构
[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
[2] USA, Res Labs, Adelphi, MD 20783 USA
[3] Eastman Kodak Co, Image Res & Adv Dev, Rochester, NY 14650 USA
[4] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
关键词
D O I
10.1063/1.122173
中图分类号
O59 [应用物理学];
学科分类号
摘要
The bulk trap state properties of a naphthyl-substituted benzidine derivative (NPB) and tris-8-(hydroxyquinoline) aluminum (Alq(3)) have been measured using thermally stimulated luminescence (TSL). The TSL spectra for both organic materials show significant trap distributions over the temperature range from 8 to 300 K. Using a general order TSL expression, the four peaks in NPB were modeled with trap states centered from 0.20 to 0.05 eV. Alq(3) has three TSL peaks over the temperature range, with the peak at 156 K modeled as a distribution of trap states from 0.25 to 0.13 eV. For both materials, the trapping mechanism involves a combination of first and second order emission. NPB and Alq(3) have trap states sufficiently deep to influence the carrier transport and recombination process in bilayer organic based light emitting. (C) 1998 American Institute of Physics.
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页码:1457 / 1459
页数:3
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