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Luminescence properties of CdxZn1-xS/ZnS/MgyZn1-yS separate confinement heterostructures (SCH), CdxZn1-xS/MgyZn1-yS multiple quantum well (MQW) structures, and CdxZn1-xS/ZnS MQW structures grown by low-pressure metalorganic chemical vapor deposition have been studied by mean of temperature-dependent and time-resolved photoluminescence spectroscopy. Biexcitonic luminescence was clearly observed from these structures at 4K. In comparison with the thermal quenching of integrated luminescence intensity observed from CdxZn1-xS/ZnS MQW structure, the thermal quenching observed from CdxZn1-xS/ZnS/MgyZn1-yS SCH structure was suppressed by approximately one order of magnitude. The suppression was attributed to the enhancement of carrier confinement effect by the insert of MgyZn1-yS cladding layer.

減圧有機金属化学気相成長(MOCVD)法により,GaAs (100)面基板上へZnSへテロエピタキシャル薄膜の成長を行った。作製されたZnSエピタキシャル薄膜の4.2kにおけるフォトルミネッセンススペクトルはZnS特有のSA発光と呼ばれる深い準位からの発光が抑えられ,自由励起子の輻射再結合が支配的であった。この自由励起子発光は室温(300k)においても観測された。自由励起子発光における線幅の温度依存性は,励起子-LOフォノン散乱および励起子-音響フォノン散乱を考慮することにより解析された。

Thin film electroluminescence (EL) device with double insulating layers was investigated using ZnS-based phosphor doped with various elements. Fabrication of thin insulating layer by ion-plating method improved the breakdown resistance and brightness of EL device as compared with the layer fabricated by electron beam deposition. It was found that calcium and bismuth fluorides emit orange and white phosphor, respectively, in the ZnS-based EL devices. The color of EL could be modified by doping two phosphor centers, such as Tb-Ce and Tb-La, in the ZnS matrix.

噴霧熱分解法による微粒子製造 4 Preparation of zinc sulfide and cadmium sulfide fine particles with different particle sizes by an ultrasonic spray pyrolysis 14 Formation of submicron copper sulfide particles by an ultrasonic spray pyrolysis 38 静電噴霧熱分解法による微粒子製造 51 Effect of electrostatic properties of spray solution on the nanometer-sized metal sulfide particles preparing by the electrospray pyrolysis 61, 研究期間:平成8-9年度 ; 研究種目:基盤研究C ; 課題番号: 08650893