Colloidal Syntheses of Semiconductor Nanoparticles with Tunable Photoluminescence in Visible-Light Region and Their Application to Photo-functional Materials

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  • 高効率で可視光発光する半導体ナノ粒子の液相合成と光機能材料への応用
  • コウコウリツ デ カシコウ ハッコウ スル ハンドウタイ ナノ リュウシ ノ エキソウ ゴウセイ ト ヒカリ キノウ ザイリョウ エ ノ オウヨウ

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Abstract

Size-quantized semiconductor nanoparticles, quantum dots, have been intensively investigated for the application to photoluminescent materials,because they exhibit unique physicochemical properties different from those of bulk materials. Many efforts have been made to develop high-quality semiconductor nanoparticles, mainly composed of binary elements, such as CdSe, CdTe, and PbS via solution-phase strategies. On the other hand, I-III-VI2 group chalcopyrite-type semiconductor nanoparticles, such as CuInS2 and AgInS2, have recently attracted much attention due to their low toxicity and wide range of absorption from UV to visible or near-infrared regions. In the present paper, we review our recent research on tunable photo-properties of size-quantized nanoparticles of Cd-based semiconductors and low-toxic chalcopyrite-type semiconductors. Size-selective photoetching enables the precise control of CdS, CdSe, and CdTe, in which the photoluminescence properties can be controlled by changing their size. The optical properties of AgInS2 nanoparticles are easily varied by making its solid solution with ZnS, in which the photoluminescent color is dependent on the chemical composition of solid solution particles.

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