Based on Zn (Ⅱ)-Ln (Ⅲ) asymmetric Schiff base complexes and light-induced near-infrared light-emitting electroluminescent device research

Title: Based on Zn (Ⅱ)-Ln (Ⅲ) asymmetric Schiff base complexes and light-induced near-infrared light-emitting electroluminescent device research Author: Wei Tao Degree-granting units: Northwestern University Keywords: asymmetric Schiff base;; df mixed metal compounds;; near-infrared light;; organic light-emitting diodes Summary: Rare earth ions (4f) near infrared (NIR) light-emitting characteristics of people in recent years on Yiqi wide attention, mainly because of its sensors, lasers, fiber-optic communications, bio-imaging has significant potential applications. In order to stimulate the Nd (Ⅲ), Er (Ⅲ), Yb (Ⅲ) and other lanthanide ions in near-infrared light, to overcome the lanthanide ions rare earth magnets parity forbidden ff transitions, a variety of antennas have been designed to sensitive groups characteristics of its light. In this paper the use of Zn (Ⅱ) asymmetric Schiff base compounds as sensitizing chromophores to near-infrared luminescence of rare earth ions, synthesis of 24 new Zn-Ln two multi-core compounds, and systematic study of its light-induced luminescence properties; and use the compounds screened as a near-infrared light-emitting diode (OLED) light-emitting layer host material, a preliminary study of its electroluminescent properties. First of all, with methyl - ethylenediamine and o-vanillin Schiff base asymmetric reaction (H2L1), to H2L1 of Zn (Ⅱ) compounds [ZnL'Py] (1) as the precursor synthesized Zn-Ln Series two nuclear compound [Zn (L1) Ln (N03) 3Py] (Ln = Nd, 2; Ln = Yb, 3; Ln = Er, 4; Ln = Gd, 5), the series of compounds to determine the molecular structure of , and studied the laws of energy transfer; while the heavy atom Br has been introduced into H2L1 H2L2, synthesized on this basis, there is heavy atom effect of Zn-Ln series two nuclear compound [Zn (L2) Ln (N03) 3Py] (Ln = Nd, 7; Ln = Yb, 8; Ln = Er, 9; Ln = Gd, 10), and determine its molecular structure and photophysical properties. Second, with 3 - benzoyl-- o-phenylenediamine and o-bromo-o-vanillin or vanillin reaction has been two asymmetric Schiff base H2L3 and H2L4, respectively, Zn (Ⅱ) complexes [ZnL3Py] ( 11) and [ZnL4Py] (16) as the precursor, synthesized Zn-Ln series of complexes (compounds Ln = Nd, 12; Ln = Yb, 13; Ln = Er, 14; Ln = Gd, 15; compounds Ln = Nd, 17; Ln = Yb, 18; Ln = Er, 19; Ln = Gd, 20), means the use of spectroscopy for H2L3 and H2L4 of Zn (II)-Ln (III) complex structure analysis to determine the their structure and studied its photophysical http://www.chinamagnets.biz/ properties. Third, based on the above thinking, with 3 - hydroxy - o-phenylenediamine and get the other two ligands H3L5 and H3L6, "one-pot" direct synthesis of both zinc - pyridine compounds [ZnHL5Py] (21) and [ZnHL6Py ] (22), synthesized as a precursor to their Zn-Ln complexes [Zn2 (L5) Ln2 (N03) 4 (Py) 2 (DMF) 2] (Ln = Nd, 23; Ln = Yb, 24; Ln = Er, 25; Ln = Gd, 26) and [Zn2 (L6) Ln2 (N03) 4 (DMF) 4] (Ln = Nd, 27; Ln = Yb, 28; Ln = Er, 29; Ln = Gd , 30), and determine its molecular structure, electronic absorption spectra, emission spectra, quantum yield and fluorescence lifetime and the antenna group of the rare earth ion energy transfer rate constant, and studied the system of heavy atom and the pyridine compound infrared light-emitting properties. Fourth, the above series of compounds selected from the representative compounds [Zn (L2) Yb (NO3) 3Py] (8) light-emitting layer doped with CuPc as the main material of infrared light-emitting devices. Device structure is ITO / TPD (40 nm) / CuPc (x%, x = 0,5,10,15): 8 (30 nm) / TPBI / LiF: Al (1:150 nm), EL position λem = 980 nm, show that these compounds in the near-infrared organic light-emitting diode has potential applications. Degree Year: 2010