Very high-efficiency green organic light-emitting devices based on electrophosphorescence

Applied Physics Letters - Tập 75 Số 1 - Trang 4-6 - 1999
Marc A. Baldo1, Sergey Lamansky2, P. E. Burrows1, Mark E. Thompson2, Stephen R. Forrest1
1Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering and the Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
2Department of Chemistry, University of Southern California, Los Angeles, California 90089

Tóm tắt

We describe the performance of an organic light-emitting device employing the green electrophosphorescent material, fac tris(2-phenylpyridine) iridium [Ir(ppy)3] doped into a 4,4′-N,N′-dicarbazole-biphenyl host. These devices exhibit peak external quantum and power efficiencies of 8.0% (28 cd/A) and 31 lm/W, respectively. At 100 cd/m2, the external quantum and power efficiencies are 7.5% (26 cd/A) and 19 lm/W at an operating voltage of 4.3 V. This performance can be explained by efficient transfer of both singlet and triplet excited states in the host to Ir(ppy)3, leading to a high internal efficiency. In addition, the short phosphorescent decay time of Ir(ppy)3 (<1 μs) reduces saturation of the phosphor at high drive currents, yielding a peak luminance of 100 000 cd/m2.

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Thông tin xuất bản

Applied Physics Letters

Tập 75 Số 1

4-6

Thông tin tác giả