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recombination efficiency in Double-Layer Organic Light-Emitting Devices

Chinese Physics Letters 2005年第3期22卷 719-722页

作者：许雪梅彭景翠翟述李宏建吴建好欧阳玉 DepartmentofAppliedPhysics HunanUniversityChangsha410082//SchoolofPhysicsScienceandTechnologyCentralSouthUniversityChangsha410083 DepartmentofAppliedPhysics HunanUniversityChangsha410082 SchoolofP-hysicsScience-andTechnology CentralSouthUniversityChangsha410083

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.

关键词： recombination efficiency Double-Layer Organic Light-Emitting Devices

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recombination efficiency and Width in Bilayer Organic Light-emitting Devices

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Semiconductor Photonics and Technology 2006年第1期12卷 5-9页

作者： PAN Yan-zhi LI Hong-jian DAI Xiao-yu FANG An-le LI jia ZHU Ru-hui Department of Applied Physics Hunan University Changsha 410082 CHN College of Physics Science and Technology Central South University Changsha 410083 CHN

A bilayer model with ohmic anode contact and injection limited cathode contact has been proposed to calculate the recombination efficiency and recombination zone width of the device. The effects of the thickness of hole transport layer and the barriers of organic/organic interface on the combination efficiency and recombination width have been discussed. It is found that：（1） When the electrons are blocked fully and the holes are not blocked significantly at the organic/organic interface, for a given Lh/L, the recombination efficiency increases with increasing the applied voltage, but at a higher applied voltage, the recombination efficiency decreases with increasing Lh/L; （2） The recombination efficiency increases with increasing applied voltage and Hh＇, and when applied voltage and Hh＇ exceed some value, the recombination efficiency appears as a plateau; （3） The recombination width decreases with increasing the applied voltage and Lh/L. This model might explain the relative experiment phenomena.

关键词： Organic light-emitting devices Hole transport layer recombination efficiency recombination width

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Luminescent efficiency in Single-layer Organic Electrophosphorescent Devices

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Semiconductor Photonics and Technology 2006年第4期12卷 245-249,261页

作者： OU Yang-jun LI Hong-jian DAI Xiao-yu College of Physics and Technology Central South University Changsha 410083 CHN Department of Applied Physics Hunan University Changsha 410082 CHN

Based on the charge injection and recombination processes and the triplet-triplet annihilation process, a model to calculate the electroluminescent(EL) efficiency is presented. The influences of the applied electric field on the injection efficiency, recombination efficiency and electroluminescent efficiency are discussed. It is found that: (1) The injection efficiency is increasing while the recombination efficiency is decreasing with the applied electric field increasing. (2) The EL efficiency is enhanced at low electric field slowly but is decreasing at high electric field with the increase of applied voltage. (3) The EL efficiency is decreasing with the increase of the host-guest molecular distance (R). So, it is concluded that the EL efficiency in single-layer organic electrophosphorescent devices is dominated by injection efficiency at lower electric field and recombination efficiency at higher electric field.

关键词： Injection efficiency recombination efficiency Energy transfer probability Electrophosphorescence efficiency

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