Molecular organic light-emitting diodes with temperature-independent quantum efficiency and improved thermal durability
- 22 November 1999
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 75 (21) , 3252-3254
- https://doi.org/10.1063/1.125315
Abstract
We demonstrate efficient and thermally stable molecular light-emitting diodes based on a multilayered structure that consists of two hole transport layers with high glass-transition temperatures, and an emitting layer doped with a highly fluorescent dye. Stable device operation was achieved up to 90° C. By using an emitting layer doped with a highly fluorescent dye, the electroluminescence quantum efficiency reaches 2.2% and does not decrease with increasing temperature in contrast to a device with an undoped emitting layer. The luminous efficiency at 100 cd/m2 increases from 4.6 lm/W at room temperature to 7.5 lm/W at 90 °C. The half-decay time of the initial luminance (∼800 cd/m2) of the devices is 3200 h (room temperature) and 200 h (80 °C) at constant dc current (10 mA/cm2).Keywords
This publication has 16 references indexed in Scilit:
- Temperature dependences of electroluminescent characteristics in the devices fabricated with novel triphenylamine derivativesIEEE Transactions on Electron Devices, 1997
- Starburst molecules based on π-electron systems as materials for organic electroluminescent devicesJournal of Luminescence, 1997
- Fabrication and performances of a double-layer organic electroluminescent device using a novel starburst molecule, 1,3,5-tris[N-(4-diphenylaminophenyl)phenylamino]benzene, as a hole-transport material and tris(8-quinolinolato)aluminum as an emitting materialIEEE Transactions on Electron Devices, 1997
- Growth of dark spots by interdiffusion across organic layers in organic electroluminescent devicesApplied Physics Letters, 1996
- Temperature Dependence of Current Transport and Electroluminescence in Vacuum Deposited Organic Light Emitting DevicesJapanese Journal of Applied Physics, 1996
- Molecular design of hole transport materials for obtaining high durability in organic electroluminescent diodesApplied Physics Letters, 1995
- Thermally stable multilared organic electroluminescent devices using novel starburst molecules, 4,4′,4″‐Tri(N‐carbazolyl)triphenylamine (TCTA) and 4,4′,4″‐Tris(3‐methylphenylphenylamino)triphenylamine (m‐MTDATA), as hole‐transport materialsAdvanced Materials, 1994
- Multilayered organic electroluminescent device using a novel starburst molecule, 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine, as a hole transport materialApplied Physics Letters, 1994
- Observation of Crystallization of Vapor-deposited TPD Films by AFM and FFMChemistry Letters, 1994
- Temperature Dependence in Emission Characteristics of an Organic EL Cell with 8‐hydroxyquinoline Aluminum Emitting LayerJournal of the Electrochemical Society, 1992