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首页> 外文期刊>Optical Materials >Photoluminescence of CdSe and CdSe/CdO • nH_2O core/shell nanoparticles prepared in aqueous solution
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Photoluminescence of CdSe and CdSe/CdO • nH_2O core/shell nanoparticles prepared in aqueous solution

机译：水溶液中制备的CdSe和CdSe / CdO•nH_2O核/壳纳米粒子的光致发光

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摘要

CdSe sols with different colors were prepared by simply mixing CdSO_4 and NaSSeO_3 solutions under [Cd~(2+)]/[Se~(2-)] ratios of 2.0-0.4 at room temperature. The nanoparticles, with average sizes of 1.8-3.6 nm, showed relatively narrow photoemission peaks at 522-556 nm. The strongest photoluminescence with a FWHM of 35 nm was obtained under [Cd~(2+)]/[Se~(2-)] ratio of 1.2. The possible mechanism for achieving the strongest photoluminescence was proposed. Photoluminescence of these particles was greatly increased by surface modification of cadmium (Ⅱ) hydrous oxide. The photoluminescence of these core-shell particles was kept constant in the pH range of 8.0-10.0, but dramatically decreased with an obvious blue-shifted peak while the pH was lower than 8.0. In addition, the photochemical oxidation of CdSe nanoparticles was markedly inhibited after they were modified with cadmium hydrous oxide.
机译：通过在室温下以[Cd〜（2 +）] / [Se〜（2-）]比[Cd〜（2 +）] / [Se〜（2-）]的比例简单混合CdSO_4和NaSSeO_3溶液来制备具有不同颜色的CdSe溶胶。平均尺寸为1.8-3.6nm的纳米颗粒在522-​​556nm处显示相对窄的光发射峰。在[Cd〜（2 +）] / [Se〜（2-）]比为1.2时，获得了FWHM为35 nm的最强光致发光。提出了实现最强光致发光的可能机制。镉（Ⅱ）水合氧化物的表面改性大大提高了这些颗粒的光致发光。这些核-壳颗粒的光致发光在8.0-10.0的pH范围内保持恒定，但在pH低于8.0时显着下降，并出现明显的蓝移峰。此外，CdSe纳米粒子被水合氧化镉改性后，其光化学氧化被显着抑制。

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