Electroluminescence from triplet excited states of benzophenone
Electroluminescence from triplet excited states of benzophenone
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二苯甲酮三重激发态的电致发光
DOI：
10.1063/1.117379
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发表时间：
1996
影响因子：
4
通讯作者：
["S. Hoshino
中科院分区：
文献类型：
--
作者：
["S. Hoshino
报道了以二苯甲酮(BP)分散的聚甲基丙烯酸甲酯(PMMA)薄膜为发光层的有机多层发光二极管(LED)的电致发光特性。在相同的工作电压和电流密度下，在273~100K温度范围内，这些LED的电致发光强度随着温度的降低而增加。发光二极管的EL谱峰值在450 nm左右，与PMMA中BP的磷光光谱相同。此外，通过施加矩形电压脉冲，还测得100K时的电致发光衰减时间为46.8μS。这些结果表明，LED的电致发光来源于BP的三重态激发态。
We report the electroluminescent characteristics of organic multilayer light‐emitting diodes(LEDs) with a benzophenone (BP) dispersed poly(methylmethacrylate) (PMMA) film as an emitting layer. The electroluminescence(EL) intensity of these LEDs increases with decreasing temperature from 273 to 100 K when they are operated at the same voltages or the same current densities. The ELspectrum of the LEDs, which peaks at around 450 nm, is identical to the phosphorescencespectrum of BP in PMMA. In addition, the EL decay time was determined as 46.8 μs at 100 K by applying a rectangular voltage pulse. These results indicate that the EL of the LED originates from the triplet excited states of BP.