Molecular light-emitting diodes using quinquethiophene Langmuir–Blodgett films

作者：Amlan J. Pal, Jari Paloheimo, Henrik Stubb · 发表于：Applied Physics Letters · 年份：1995 · DOI：10.1063/1.115314 · 被引用次数：35 · 研究领域：Molecular Junctions and Nanostructures、Photoreceptor and optogenetics research、Advanced Thermodynamics and Statistical Mechanics

We report extended studies on electroluminescence from molecularly thin semiconducting Langmuir–Blodgett films of quinquethiophene. The effect of the thickness of active layer and cathode electrode material has been investigated. From all these devices, greenish electroluminescence (visible in a dark room) has been observed with quantum efficiencies of the order of 10−3%. Even five or nine layers of Langmuir–Blodgett films yield the same luminance as thicker films. The electroluminescence spectrum showed a profile identical to the photo- luminescence spectrum.