氧化锌纳米颗粒薄膜的近紫外电致发光特性研究*
Near ultraviolet luminescence characteristics of ZnO nanoparticle film
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摘要: 利用溶胶-凝胶法(sol-gel method)制备了ZnO纳米颗粒薄膜(ZnO nanoparticle film),并以此为发光层制备了结构为ITO/ZnO nanoparticle/MEH-PPV/LiF/Al的电致发光器件。通过调整器件发光层厚度,对器件的发光光谱和电学特性进行测试研究,发现该器件在一定的直流电压下可以得到以ZnO近紫外(中心波长390 nm)发光为主的电致发光光谱,显示出较好的ZnO近紫外电致发光特性。对该器件的发光机理进行了一定的研究,认为该器件的发光是基于载流子隧穿。Abstract: In this paper, ZnO nanoparticle film is synthesized by using a sol-gel method. Then ITO/ZnO nanoparticles/MEH-PPV/LiF/Al heterostructure devices are fabricated. Next, the emission spectra and electrical properties of the devices are measured for different thickness of the ZnO nanoparticle films. Under DC bias, ultraviolet (UV) electroluminescence (EL) from ZnO band edge emission is observed. When the voltage is higher than 12 V, the UV electroluminescence at 390 nm from ZnO band edge emission can be observed clearly. The EL mechanisms are discussed in terms of carrier tunneling process.
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