Abstract

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.

Keywords

PhosphorescencePhosphorescent organic light-emitting diodeIridiumPhosphorQuantum efficiencyOptoelectronicsMaterials scienceExcited stateDopingElectroluminescencePhotochemistryChemistryFluorescenceOpticsPhysicsAtomic physicsNanotechnologyCatalysis

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Year
1999
Type
article
Volume
75
Issue
1
Pages
4-6
Citations
2827
Access
Closed

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Marc A. Baldo, Sergey Lamansky, P. E. Burrows et al. (1999). Very high-efficiency green organic light-emitting devices based on electrophosphorescence. Applied Physics Letters , 75 (1) , 4-6. https://doi.org/10.1063/1.124258

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DOI
10.1063/1.124258