Recombination Efficiency in Double-Layer Organic Light-Emitting Devices

We analyse the influence of properties of organic/organic interface (OOI) on the characteristics of recombination efficiency of organic double-layer light-emitting diodes. Based on the disordered hopping theory model, spatial and energetic disorder of hopping states are also discussed for the case of space charge limited currents in hole transmitting layers but injection-limited currents in electron transporting layers. The results show that the recombination efficiency increases firstly and then decreases for different OOI parameters, and there is a maximum value changed with different spatial disorder parameters and energetic disorder scale. Different spatial disorder parameters make carrier mobilities change greatly, and the energetic disorder scale causes various localized state densities. Our calculated results are qualitatively in agreement with the experimental data.     

物理实验开放式教学的运作与思考

物理实验是融物理思想和实验技术于一体的一门实践性课程,在培养学生的科学研究、新技术适应、开拓创新能力中起着启蒙和奠基的作用.近几年来,为适应培养高质量跨世纪创新型人才的需要,我们在物理实验教学内容、课程体系改革中作了有益的探索和实践,建立了以能力培养为主线的循序渐进的多层次教学模式[1],并进行了开放式教学的研究.我们对我校98级1100余名学生实行了全开放式教学,形成了一套有效的运作方法,也给我们带来了深入改革的新思考.