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Research Of Organic Electroluminescent Devices With Photovoltaic Characteristics

Posted on:2005-02-26Degree:DoctorType:Dissertation
Country:ChinaCandidate:H Z WeiFull Text:PDF
GTID:1118360152475009Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
Extensive attention has been paid for organic electroluminescence (OEL) for its unique advantages in the field of modem display technique. At the mean time, organic photovoltaic (OPV) becomes a research hotspot because the cells can be made with low cost, simple for techniques, and easy for large scale, it is anticipated to develop a new way for the application of solar energy or photo-detector. Due to the same structure for OEL devices and OPV cells, it is possible for one device to possess characteristics of either OEL or OPV functions. In this thesis, some basic research work is carried out based on OEL and OPV characteristics. Basing on typical doping bright green and red OEL devices, the OPV characteristics of the devices are discussed, and the contributions and effects of every organic functional layer on the OPV characteristic are discussed in particular. Basing on the relation of exciplex in the interface between organic functional layers, OPV cells are fabricated by selecting typical organic small molecular materials. The characteristics and rules of the OPV cells are explored firstly, and the OEL characteristics of the OPV cells are also discussed. Especially by careful choice of materials, white OEL device with OPV characteristic is firstly fabricated. This made it possible to benefit solar energy to driving the white OEL device directly for the panel display or acting as backlight in the future.Rare earth (RE) complexes show the characteristic of sharp-band emissions, and they all posses transporting mobility for carriers to some extent. However, there are exciplex emission in the interface between the RE complex and the hole transporting materials which limited the application of the rare earth complex for OEL. In thispaper the RE complex is discussed from two aspects. By optimizing device which eliminates the effect of exciplex formation on the properties of the device, the no-doping efficient blue OEL device is fabricated using Gd(DBM)3bath as electron transporting material. By introducing hole blocking layer and alternate multilayer hole transporting layer which overcomes the disturbing of exciplex formation on Eu3+ characteristic emission, relative high efficient and bright Eu3+ characteristic emission red OEL device using Eu(DBM)3bath as the whole emitting layer is fabricated. The fabrication process is simpler and more easily compared with typical doping style or blurry interface style Eu3+ characteristic emission red OEL device.
Keywords/Search Tags:Organic electroluminescence, Organic photovoltaic, Exciplex, white OLED, Rare earth complex
PDF Full Text Request
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