High brightness stable white and yellow light-emitting diodes from ambipolar polyspirofluorenes with high charge carrier mobility
- 27 August 2007
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 91 (9) , 093502
- https://doi.org/10.1063/1.2776349
Abstract
We have used two polyspirofluorenes, spirodiethylhexyloxylpolyfluorene (spiro-diEHPF) and triphenylamine-grafted spirodiethylhexyloxylpolyfluorene (spiro-TPA50-diEHPF), which exhibit rather high chargemobilities in the order of 10 − 3 – 10 − 4 cm 2 ∕ V s . The light-emitting devices with rubrene-doped spiro-diEHPF show maximal luminances of 36 000 and 70 000 cd ∕ m 2 with maximal efficiencies 3.5 and 9 cd ∕ A for the white and yellow emissions, respectively. For rubrene-doped triphenylamine-grafted polymer, spiro-TPA50-diEHPF, the maximal luminances and efficiencies are 56 000 cd ∕ m 2 and 9 cd ∕ A for white-emitting devices and 72 000 cd ∕ m 2 and 14 cd ∕ A for yellow emission. Furthermore, the electroluminescence profiles of the investigated devices show nearly independent of the applied voltages.Keywords
This publication has 8 references indexed in Scilit:
- Achieving High‐Efficiency Polymer White‐Light‐Emitting DevicesAdvanced Materials, 2005
- Efficient white-light-emitting diodes based on polymer codoped with two phosphorescent dyesApplied Physics Letters, 2005
- Highly Efficient Light-Emitting Diodes Based on Fluorene Copolymer Consisting of Triarylamine Units in the Main Chain and Oxadiazole Pendent GroupsMacromolecules, 2005
- Unusual Nondispersive Ambipolar Carrier Transport and High Electron Mobility in Amorphous Ter(9,9-diarylfluorene)sJournal of the American Chemical Society, 2003
- Recent progress of molecular organic electroluminescent materials and devicesMaterials Science and Engineering: R: Reports, 2002
- Improving efficiency by balancing carrier transport in poly(9,9-dioctylfluorene) light-emitting diodes using tetraphenylporphyrin as a hole-trapping, emissive dopantApplied Physics Letters, 2001
- Effects of aggregation on the excitation transfer in perylene-end-capped polyindenofluorene studied by time-resolved photoluminescence spectroscopyPhysical Review B, 2001
- Charge Transport in Disordered Organic Photoconductors a Monte Carlo Simulation StudyPhysica Status Solidi (b), 1993