| Abstract
| - We have synthesized a series of diphenylamine-substituted coumarin, (dicyanomethylene)pyran, and benzophenoxazone dyes and report on their optical and electroluminescentproperties, thermal and photooxidative stabilities, and potential as red and green dopantsfor organic light-emitting diode (OLED) displays or down-conversion fluorescent dyes forexternal color-converters. Incorporation of the bulky phenyl groups in these dyes delays theonset of concentration quenching when they are dissolved in polymer films. Their improvedphotoluminescent efficiency and photooxidative stability make them excellent candidatesfor external color-conversion. The improved electroluminescence and power efficiencies andenhanced thermal stability of 3-(2‘-benzimidazolyl)-7-(diphenylamino)-2H-1-benzopyran-2-one (C7S) as well as its Commission Internationale d'Eclairage (CIE) coordinates suggestsits use as a green dopant in OLED devices.
- We have synthesized a series of diphenylamine substituted fluorescent dyes and investigated their optical and electroluminescent properties and thermal and photooxidative stabilities. The incorporation of bulky phenyl groups reduces concentration quenching. Their improved photoluminescent and electrooptical properties suggests their use in color-conversion materials and as dopants in OLEDs.
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