Light-Emitting Organic Materials with Variable Charge Injection and Transport Properties
Novel light-emitting organic materials comprising conjugated oligomers chemically attached via a flexible spacer to an electron- or hole-conducting core were designed for tunable charge injection and transport properties. Representative glassy-isotropic and glassy-liquid-crystalline (i.e., noncrysta...
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Published in | Chemistry of materials Vol. 18; no. 1; pp. 204 - 213 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Chemical Society
10.01.2006
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Subjects | |
Online Access | Get full text |
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Summary: | Novel light-emitting organic materials comprising conjugated oligomers chemically attached via a flexible spacer to an electron- or hole-conducting core were designed for tunable charge injection and transport properties. Representative glassy-isotropic and glassy-liquid-crystalline (i.e., noncrystalline solid) materials were synthesized and characterized; they were found to exhibit a glass transition temperature and a clearing point close to 140 and 250 °C, respectively; an orientational order parameter of 0.75; a photoluminescence quantum yield up to 51%; and HOMO and LUMO energy levels intermediate between those of blue-emitting oligofluorenes and the ITO and Mg/Ag electrodes commonly used in organic light-emitting diodes, OLEDs. This class of materials will help to balance charge injection and transport and to spread out the charge recombination zone, thereby significantly improving the device efficiency and lifetime of unpolarized and polarized OLEDs. |
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Bibliography: | istex:762BD6DA48190BC7DD5B6B35D7893D3C43130BC1 ark:/67375/TPS-VTMQC7GP-5 FC52-92SF19460 USDOE DOE/SF/19460-645 |
ISSN: | 0897-4756 1520-5002 |
DOI: | 10.1021/cm0519582 |