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degjh木蟲 (小有名氣)
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[求助]
中譯英文一段
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| 稀土摻雜的復(fù)合氟化物是一類重要的上轉(zhuǎn)換發(fā)光基質(zhì)材料,具有優(yōu)異的光頻轉(zhuǎn)換性能。然而,當(dāng)稀土摻雜復(fù)合氟化物材料的空間尺寸減小到納米量級時,晶體中原子排列方式發(fā)生改變,從而引起小尺寸效應(yīng)以及表面效應(yīng)。顯然,這些納米效應(yīng)是與基質(zhì)材料的結(jié)構(gòu)單元的種類有著密切的關(guān)系。NaYF4的主要結(jié)構(gòu)單元是YF8多面體結(jié)構(gòu)單元,而BaY2F8的結(jié)構(gòu)單元是YF8 和BaF12兩種多面體結(jié)構(gòu)單元。所以,對NaYF4和BaY2F8來說,引起納米效應(yīng)的尺寸是不同的。我們利用熱分解技術(shù)、水熱技術(shù)來制備尺寸分布窄、結(jié)晶度高、分散性好的稀土離子摻雜納米顆粒,觀測基質(zhì)材料的納米效應(yīng)尺寸,研究敏化劑、激活劑離子在基質(zhì)中的微觀環(huán)境、能量傳遞效率、量子產(chǎn)率和上轉(zhuǎn)換發(fā)光強度,為藍(lán)色固體激光器件開發(fā)打下基礎(chǔ)。 |
榮譽版主 (文壇精英)
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專家經(jīng)驗: +518 |
榮譽版主 (文壇精英)
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專家經(jīng)驗: +518 |
| Rare-earth Doped Complex Fluoride is an important type of host material for up-conversion luminescence, which has good efficiency in optical frequency conversion. However, when the spacial dimension of this material reduced to nanometer level, atomic arrangement become change,thus produce small size effect and surface Obviously, these nano effect has have a close relation with the structure unit and kind of host material. The basic unit of NaYF4 is YF8 polyhedron, while the structural units of BaY2F8 are YF8 polyhedron and BaF12 polyhedron. So, the sizes could cause nano effect in NaYF4 is different with which in BaY2F8. We will use the thermal decomposition technology, hydrothermal technology to prepare of rare earth ions doped nanoparticles with narrow size distribution, high crystallinity and good dispersity, test the sizes result in nano effect in these host materials, study the micro environment of sensitizers and activator ions, energy transfer efficient, quantum yield and up-conversion luminescence intensity. What we do will lay the foundation for the solid blue laser device development. |
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