Emission Zone Control in Blue Organic Electrophosphorescent Devices Through Chemical Modification of Host Materials
We report blue organic light-emitting devices with iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (FIrpic) as an emitter doped into a series of phosphine oxide-based host materials that have significantly different charge transport properties: 4-(diphenylphosphoryl)-N,N-diphenylaniline (HM-A1), N-(4-diphenylphosphoryl phenyl) carbazole (PO12), 9-(6-(diphenylphosphoryl)pyridin-3-yl)-9H-carbazole (HM-A5), and 6-(diphenylphosphoryl)-N,N-diphenylpyridin-3-amine (HM-A6). Depending on the nature of the host material, the location of the emission zone can be moved within the emissive layer from the hole transport layer interface to the electron-transport layer interface. The charge transport properties of the materials were evaluated using single carrier devices.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 984999
- Report Number(s):
- PNNL-SA-68607; 35598; 830403000
- Journal Information:
- Applied Physics Letters, 96(5):Art. No. 053306, Journal Name: Applied Physics Letters, 96(5):Art. No. 053306 Journal Issue: 5 Vol. 96; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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