Effects of singlet and triplet energy transfer to molecular dopants in polymer light-emitting diodes and their usefulness in chromaticity tuning
Efficient, white emission with Commission Internationale de L'Eclairage coordinates of 0.33, 0.42 is demonstrated from polymer light-emitting diodes operating at high brightness. An amino endcapped polyfluorene derivative doped with rubrene was used as the active layer, in combination with a poly(3,4-ethylenedioxythiophene) hole transport layer. Luminescence reaches 14950 Cd/m{sup 2} at a current density of 150 mA/cm{sup 2}, and the maximum external quantum efficiency measured 1.05% for a bias voltage of 9.0 V. We observe a fall in external quantum efficiency relative to the undoped device, which we ascribe to an increased singlet--triplet annihilation rate at the dopant sites. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40230728
- Journal Information:
- Applied Physics Letters, Vol. 79, Issue 6; Other Information: DOI: 10.1063/1.1389070; Othernumber: APPLAB000079000006000857000001; 034130APL; PBD: 6 Aug 2001; ISSN 0003-6951
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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