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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Blue emitting thin-film electroluminescent devices utilizing Tm-doped ZnS nanocrystals
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Blue emitting thin-film electroluminescent devices utilizing Tm-doped ZnS nanocrystals

机译：利用Tm掺杂ZnS纳米晶体的发蓝光薄膜电致发光器件

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摘要

Novel blue thin-film electroluminescent (TFEL) devices comprised of TM3+-doped ZnS nanocrystals (NCs) have been investigated employing a conventional double insulating TFEL device structure. The luminescent properties of Tm3+-doped ZnS NCs (ZnS:Tm) with different Tm concentrations are studied in comparison with those of the ZnS:Tm thin film and phosphor. The concentration quenching effects of both photoluminescence (PL) and electroluminescence (EL) were observed when the Tm concentration was in excess of 3 mol%. In contrast with the EL spectrum of conventional ZnS:Tm TFEL device, in which infrared emission band is dominant rather than blue emission band, the blue emission band prevails in the EL spectrum of the ZnS:Tm NC TFEL device. Furthermore, as the driving-voltage increased, the EL intensity of the blue band relatively increased in comparison with the increase in the EL intensity, which indicates the EL excitation mechanism is ascribed to direct-impact excitation of Tm3+ by hot-electrons. Finally, the full-color TFEL device utilizing the activator-ion-doped ZnS NCs is demonstrated, and the operation characteristics of the full-color TFEL device are presented. (c) 2006 Elsevier B.V. All rights reserved.
机译：已经研究了采用传统的双重绝缘TFEL器件结构的新型TM蓝色掺杂的ZnS纳米晶体（NC）组成的蓝色薄膜电致发光（TFEL）器件。与ZnS：Tm薄膜和荧光粉相比，研究了不同Tm浓度的掺Tm3 +的ZnS NCs（ZnS：Tm）的发光特性。当Tm浓度超过3mol％时，观察到光致发光（PL）和电致发光（EL）的浓度猝灭作用。与传统的ZnS：Tm TFEL器件的EL光谱相反，在红外光谱中，红外发射带占主导，而不是蓝色发射带，而ZnS：Tm NC TFEL器件的EL光谱中则占主导地位。此外，随着驱动电压的增加，蓝带的EL强度与EL强度的增加相比相对增加，这表明EL激发机理归因于热电子对Tm3 +的直接冲击激发。最后，演示了利用活化剂掺杂的ZnS NCs的全色TFEL器件，并介绍了该全色TFEL器件的工作特性。 （c）2006 Elsevier B.V.保留所有权利。

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