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Design/Synthesis and Optoelectronic Properties of Silicon-containing Wide Bandgap Hosts

Author: HuDeHua
Tutor: MaZuoGuang；LuPing
School: Jilin University
Course: Polymer Chemistry and Physics
Keywords: Silane Wide Bandgap parent Phosphorescence Optoelectronic properties
CLC: TN383.1
Type: PhD thesis
Year: 2011
Downloads: 87
Quote: 1
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Abstract

Application of the metal complex phosphorescent materials greatly improve the efficiency of the organic electroluminescent device, but the phosphorescent material because of its long excited state lifetime, in the case of a high concentration of easily occur between the triplet exciton quenching, which usually the form of a low concentration of doped into the parent material in the production of the electron emitting device, the precursor material is a light emitting layer as a whole bearing body, and thus the selection of the matrix material and their own nature will directly affect the effect of the entire device. This thesis is based on the design and synthesis of new parent material system, study material structure and the nature of the relationship, and the final device performance feedback to refine the design ideas of the parent material, the main contents include the following four aspects: 1. Playing 6-Si off the main chain of a fluorene structure and a non-conjugated manner introduced carbazole alkyl chains were designed and synthesized a polymer having a different band gap and the different side groups, and oligomers. Systematically studied the influence of the structure on the properties of the band gap of the precursor material and the hole injection; doped with the red, green and blue color of the object by comparing the performance of the device and found that has a wider band gap and better hole injection The precursor material having a more superior device performance. 2 in order to enhance the electron injection and transport properties of the polymer matrix material, will have a strong affinity electrical properties cyano does not affect the form of alkyl chains in the polymer is introduced under the premise of the polymer band gap, single carrier sub-devices and the UPS Characterization proved cyano final doping device data indicate that for the polymer on the electron injection and transport properties of improvement, and by introducing different content of the cyano group to adjust the balance of the carrier and the film morphology; both The carrier transmission balance of properties and good film properties of the parent material can be obtained a better device performance. 3 tetraphenyl silicon No. 9-bit non-conjugated coupling carbazole and poly carbazole designed and synthesized a series of higher triplet energy, better thermodynamic performance and more stable film morphology The wide bandgap small molecules parent material. Select one of the materials prepared by evaporation and spin coating of the Blu-ray devices, have received good performance, good stability and performance. 4 in order to enhance the nature of the small molecule electron injection and transport of the parent material, a non-conjugated manner introduced into the pyridine synthesis Bipolar properties of the parent material, under the premise of maintaining the material Middle Line state energy, showing the lower the LUMO level. Doped blue and green device shows the potential of the bipolar precursor material in the application of the device.

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