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Abstract: In this paper, a zinc (II) complex of Zn2(4-tfmBTZ)4 (4-tfmBTZ=2-(4-trifluoromethyl-2-hydroxyphenyl)benzothiazolate) was reported. Via combination of experimental and theoretical approaches, its molecular structure, photophysical characteristics, electronic structure and electroluminescent properties were investigated. The results indicate that Zn2(4-tfmBTZ)4 exists as five-coordinate geometric structure and two zinc atoms are bridged by oxygen atoms. The intense absorption band was located at 404nm, which mainly originate from the transition HOMO−1 to LUMO+2. The blue-light emission was observed in tetrahydrofuran solution and thin film. White-light emission with four emission peaks was observed with CIE coordinate of (0.29, 0.33) and a higher CRI of 85.1 by fabricating bilayer device using Zn2(4-tfmBTZ)4 as electron-transport and NPB as hole-transport material. [Copyright &y& Elsevier]

Abstract: In this article, the molecular structure, photoluminescent and electroluminescent properties of bis(2-(4-methyl-2-hydroxyphenyl) benzothiazolate) zinc (Zn(4-MeBTZ)2) with good electron-transport characteristics were reported. This complex was identified as triclinic structure with the strong intermolecular π–π stacking interactions between the benzothiazolate/phenoxido rings and weak intramolecular hydrogen bonds by X-ray single-crystal diffraction. Quantum chemical method has been employed to investigate electron structure and charge transport property. The blue-green light emission was observed by fabricating double-layer devices using Zn(4-MeBTZ)2 as electron-transport and NPB as hole-transport material. The performance of organic light-emitting devices based on Zn(4-MeBTZ)2 is much better than that of the devices based on [Zn(BTZ)2]2. [Copyright &y& Elsevier]

Abstract: A novel blue-light organic electroluminescence material (OEM) derived from 8-hydroxyquinoline lithium (Liq), bis[(8-hydroxyquinolin)lithium·8-hydroxyquinolin] sodium ([Liq·q−]2·2Na+), was synthesized and investigated. For stereo molecular structure and presence of sodium ions, [Liq·q−]2·2Na+ exhibits higher quantum yield and longer fluorescence lifetime than Liq. When used as light-emitting layer in organic light-emitting diode (OLED), [Liq·q−]2·2Na+ shows the maximum emission peak at 489nm in electroluminescence spectra and emits bluer light with higher current efficiency stability than Liq. Moreover, [Liq·q−]2·2Na+ exhibits excellent thermal stability and film formability. [Copyright &y& Elsevier]