Improved red dopants for organic electroluminescent devices
Improved red dopants for organic electroluminescent devices
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DOI：
10.1002/masy.19981250103
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发表时间：
1998-01-01
影响因子：
--
通讯作者：
Klubek, KP
中科院分区：
文献类型：
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作者：
Chen, CH;Tang, CW;Klubek, KP
4-（二氰乙烯）-2-t-丁基-6-（1,1,7,7-四甲基julolidyl-9-烯基）- 4h -吡喃（DCJTB）取代的红色荧光染料是AlQ(3)中一种优良的掺杂剂，它可以生产出一种高效的有机发光器件，提高了红色色度。与4-（二氰乙烯）-2甲基-6-(1,1,7,7-四甲基julolidyl-9-enyl)- 4h -pyran （DCJT）不同，DCJTB可以直接从不对称的4-（二氰乙烯）-2-（t-丁基）-6-甲基- 4h -pyran中以纯形式合成，而不会污染DCJT制备中普遍存在的非荧光双缩合副产物。AlQ(3)中DCJTB固体膜的光致发光和电致发光都被额外的t-丁基取代而适度增强，这是由于浓度猝灭效应的减弱。DCJTB掺杂EL器件的工作稳定性较好，在初始亮度> 400 cd/m下驱动的半衰期超过5000 h(2)。
A t-butyl substituted red fluorescent dye, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB), has been found to be an excellent dopant in AlQ(3) which produces a highly efficient organic EL device with improved red chromaticity. Unlike 4-(dicyanomethylene)-2 methyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJT), DCJTB can be synthesized in a pure form directly from the unsymmetrical 4-(dicyanomethylene)-2-(t-butyl)-6-methyl-4H-pyran without the contamination of the non-fluorescent bis-condensation byproduct which is prevalent in the DCJT preparation. Both photoluminescence and electroluminescence in the solid films of DCJTB in AlQ(3) are modestly enhanced by the extra t-butyl substitution as a result of a reduction in the effect of concentration quenching. The operation stability of the DCJTB doped EL device is superior, having a half-life of over 5,000 h driven at an initial brightness > 400 cd/m(2).