Research On The Composite Charge Transport Layer In The Quantum Dot Device

Quantum dot is a kind of ideal fluorescent material,7which can adjust the fluorescence emission wavelength can through controlling their size, and has a wide excitation spectrum, high quantum yield of fluorescence, narrow emission spectrum, long fluorescence lifetime, tunable color and photochemical stability. These properties make semiconductor quantum dots have a wide range of applications in various optoelectronic devices, single electron devices, biological identification, and memories. It is of great theoretical significance and application value to study the quantum dot light emitting devices and to improve their performance.In this thesis, quantum dot electroluminescent performance is the research object. In order to improve the performance of quantum dot devices, we changed the traditional single hole transport layer device, the mixed layer PVK. and NPB as hole transport layer of the device, are as follows:(1) The composite type the hole transport layer devices are compared with the traditional single layer devices, which proved that the application of composite hole transporting layer improved the device performance; (2) Then, we use composite hole transport layer and the optimum thickness of composite hole transporting layer in each monochromatic light device in various monochromatic light devices; (3) Furthermore, we get the optimum proportion in each monochrome composite optical devices in the hole transport layer based on the optimum thickness and mixing ratio of PVK and NPB;(4) Finally, we use ZnO Nano particles instead of PFN as an electron transport layer of the device, which proves that the performance of the device is significantly improved.The advantage of quantum dots makes it more and more widely used in our daily life. It has drawn great attention to the researchers. Quantum dot light emitting device carrier and current density changing with the composite hole transport layer conditions change and work voltage, can provide important guidance and reference for processing is good and stable physical and chemical properties of the quantum dot electrically emitting devices.