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Study on the Preparation and Luminescent Properties of Organic Semiconductors Containing Phenothiazine and Oxadiazole Units

Author: XuFeng
Tutor: YinShouGen
School: Tianjin University of Technology
Course: Condensed Matter Physics
Keywords: The organic semiconductor The organic electroluminescent device PPV derivatives Phenothiazine derivatives Polyarylether Oxadiazole heterocyclic Wittig- Horner reaction
CLC: TN304.05
Type: Master's thesis
Year: 2005
Downloads: 190
Quote: 0
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Abstract


In recent years, the molecular design of organic semiconductor materials, Synthesis and applied research in organic electroluminescent light emitting devices has become one of the hot research of organic solids. Be changed by modifying the chemical structure of the organic semiconductor material to adjust its level, the transmission type, and Institute of the various properties of the electroluminescent device. This thesis is specifically undertaken in the preliminary study of the following four aspects: (a) the design and synthesis of three phenothiazine derivatives small organic molecules electroluminescent material PTH-I, PTH-II, PTH-III. UV - visible absorption (UV-vis), fluorescence spectroscopy (PL), cyclic voltammetry (CV), electrical means of luminescence spectroscopy (EL) characterization of the physical and chemical properties of the material, and to prepare a single, double light-emitting device, to obtain a phenothiazine derivative of Small Molecules electroluminescent. (B) successful the phenothiazine derivatives small molecule electroluminescent based on further synthesized containing phenothiazine units PPV type electric luminescent material P-PT-OXA-EH. The polymer production rate of 34.20%, Mn = 8.6296e3, Mw = 1.1355e4 Tdc = 352 oC, the material has good thermal stability; increase of the polymer by the introduction of long side-chain alkyl groups (-OC12H25,-EH) The dissolution properties. Three devices PT-A, PT-B and PT-C light emitting performance of the device structure (ITO / P-PT-OXA-EH (1.0%, 0.5%, 0.3%) / Ca / Ag): PL EL emission peak at 551 nm and 566 nm, respectively, glows bright yellow green; the Qiliang voltage of the device, respectively: 20 V, 10 V, 5 V; three devices maximum luminance of 300 cd/m2 (30 V ), 800 cd/m2 (20 V), 2000 cd/m2 (15 V); PT-C device, when the current is 47.5 mA The device luminance of 2000 cd/m2, almost the same kind of single layer PPV device tenfold. (C) a typical Wittig-Horner polymerization were designed and synthesized containing oxadiazole unit PPV type electric luminescent material P-OXA-II. Yield: 47.10%; long alkoxy groups (-OC8H17-OEH) improve the dissolution properties of the rigid-PPV polymer. A light emitting performance of the device (ITO / P-OXA-II (0.5%) / Ca / Ag): PL and EL emission peak at 530 nm (Ex: 450 nm) and 545 nm, issued strong green ; the Qiliang voltage of the device to 17 V; the device maximum luminance of 320 cd/m2 (22 V); diode device with excellent characteristics. (D) were designed and synthesized for the first time a non-conjugated polymer light-emitting material PEI. The polymerization yield 92.10%; Mn = 8.1889e3, Mw = 3.3306e4; polymer having good solubility and thermal stability. Built from the materials of the single layer device (ITO / PEI / Ca / Ag), and its luminous performance: when a current of 5 mA, EL emission peak for 428 nm, the luminous intensity of 10 cd/m2, emits blue light; PL The maximum absorption wavelength for 374 nm, the film state of the PL peak lambda max = 439 nm; Qiliang device voltage is 30 V; when a current of 16 mA, the light emitting luminance of 20 cd/m2 (40 V).

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