| 有机-无机杂化凝胶法合成YAG∶Ce3+荧光粉的包膜及其稳定性 |
| Coating and Stability of YAG∶Ce3+ Phosphor Synthesized Using Inorganic-organic Hybrid Gel Method |
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| 摘要: 本文以金属硝酸盐为原料，柠檬酸为配位剂的有机-无机杂化凝胶法来合成掺杂三价铈离子的钇铝石榴石荧光粉，采用X-射线衍射法研究了杂化凝胶在煅烧过程中的相转变机制。结果表明:杂化凝胶在煅烧过程中可以通过两条途径形成Y3Al5O12(YAG)相:一是由无定形Y2O3和Al2O3直接向YAG相的一步相转变;二是由无定型Y2O3 |
| 关键词: YAG∶Ce3+荧光粉 无机-有机杂化凝胶 相转变 包膜 |
| 基金项目: |
| Abstract: Using metal nitrates as starting materials and citric acid as complexing agent， Y3Al5O12∶Ce3+(YAG∶Ce3+) phosphor was prepared by inorganic-organic hybrid gel method. The formation process of Y3Al5O12(YAG， Yttrium Aluminum monoclinic) phase was investigated by means of XRD. The results show that the YAG phase can be formed by two routs， one is the direct phase transformation from amorphous ytterium oxide and aluminium oxide to YAG phase， another is a two steps process from amorphous ytterium oxide and aluminium oxide to YAlO3(YAP) and γ-Al2O3 intermediate phases， and then turn to YAG. The YAG∶Ce3+ phosphor with pure crystalline phase was obtained at 900℃， which is 600℃ lower than that of conventional solid reaction method. This phosphor absorbs excitation energy in the range 403～510nm with the maximum excitation wavelength at near 459nm and shows a yellow emission in the range 480～650nm with maximum intensity at 550nm. At the same time， this phosphor was coated with Al2O3 and La2O3 by using sol-gel method and hydroxide precipitation method respectively. The photo-luminescence properties of the coated phosphors were also investigated comparatively by treating the phosphor in hot oxidation atmosphere， acid and base solution. It was found that a slight decrease of luminescence intensity and an improvement in phosphor maintenance was observed due to the surface modification of phosphors caused by coating. |
| Keywords: Y3Al5O12∶Ce3+(YAG∶Ce3+) phosphor inorganic-organic hybrid gel phase transformation coating |
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| 李永绣,闵宇霖,周雪珍,游效曾.有机-无机杂化凝胶法合成YAG∶Ce3+荧光粉的包膜及其稳定性[J].无机化学学报,2003,19(11):1169-1174. |
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