A Highly Efficient, Blue‐Phosphorescent Device Based on a Wide‐Bandgap Host/FIrpic: Rational Design of the Carbazole and Phosphine Oxide Moieties on Tetraphenylsilane
- 13 April 2012
- journal article
- research article
- Published by Wiley in Advanced Functional Materials
- Vol. 22 (13) , 2830-2836
Abstract
A new series of wide‐bandgap materials, 4‐dipenylphosphine oxide‐4′‐9H‐carbazol‐9‐yl‐tetraphenylsilane (CSPO), 4‐diphenylphosphine oxide‐4′,4″‐di(9H‐carbazol‐9‐yl)‐tetraphenylsilane (pDCSPO), 4‐diphenylphosphine oxide ‐4′‐[3‐(9H‐carbazol‐9‐yl)‐carbazole‐9‐yl]‐tetraphenylsilane (DCSPO), 4‐diphenylphosphine oxide‐4′,4″,4″′‐tri(9H‐carbazol‐9‐yl)‐tetraphenylsilane (pTCSPO) and 4‐diphenylphosphine oxide ‐4′‐[3,6‐di(9H‐carbazol‐9‐yl)‐9H‐carbazol‐9‐yl]‐tetraphenylsilane (TCSPO), containing different ratios and linking fashions of p‐type carbazole units and n‐type phosphine oxide units, are designed and obtained. DCSPO is the best host in FIrpic‐doped devices for this series of compounds. By utilizing DCzSi and DPOSi as hole‐ and electron‐transporting layers, a high EQE of 27.5% and a maximum current efficiency of 49.4 cd A−1 are achieved in the DCSPO/FIrpic doped device. Even at 10 000 cd m−2, the efficiencies still remain 41.2 cd A−1 and 23.0%, respectively.Keywords
This publication has 25 references indexed in Scilit:
- Properties of Fluorenyl Silanes in Organic Light Emitting DiodesChemistry of Materials, 2010
- Recent Progress in GaN‐Based Light‐Emitting DiodesAdvanced Materials, 2009
- Silane coupling di-carbazoles with high triplet energy as host materials for highly efficient blue phosphorescent devicesJournal of Materials Chemistry, 2009
- A Highly Efficient Host/Dopant Combination for Blue Organic Electrophosphorescence DevicesAdvanced Functional Materials, 2008
- Novel host material for highly efficient blue phosphorescent OLEDsJournal of Materials Chemistry, 2007
- Ultraviolet electroluminescence and blue-green phosphorescence using an organic diphosphine oxide charge transporting layerApplied Physics Letters, 2006
- Highly Efficient Organic Blue Electrophosphorescent Devices Based on 3,6‐Bis(triphenylsilyl)carbazole as the Host MaterialAdvanced Materials, 2006
- New Dopant and Host Materials for Blue‐Light‐Emitting Phosphorescent Organic Electroluminescent DevicesAdvanced Materials, 2005
- Ultrahigh Energy Gap Hosts in Deep Blue Organic Electrophosphorescent DevicesChemistry of Materials, 2004
- Efficient, deep-blue organic electrophosphorescence by guest charge trappingApplied Physics Letters, 2003