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首页> 外文期刊>RSC Advances >Y2BaZnO5:Er3+ microcapsules with enhanced upconversion by vanadium ion codoping
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Y2BaZnO5:Er3+ microcapsules with enhanced upconversion by vanadium ion codoping

机译：Y2BAZNO5：ER3 +微胶囊具有增强的钒离子编码增强

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Microcapsules of Y _(2) BaZnO _(5) :Er ~(3+) nanocrystals were successfully prepared by a simple hydrothermal method using citric acid as chelating agent. The sizes of the spherical microcapsules varied between 1–5 μm with a wall thickness of about 50–100 nm. The underlying microcapsule formation mechanism was discussed using the gas-bubble-assisted Ostwald ripening process. The Y _(2) BaZnO _(5) :Er ~(3+) microcapsules exhibited characteristic upconversion (UC) emissions of Er ~(3+) with intense yellowish orange color under dual laser pumping at 808 nm as well as 980 nm. Concentration dependent studies revealed that the optimum Er ~(3+) concentration for intense UC at 550 nm and 660 nm was 5 mol% and 7 mol%, respectively. In addition, the optimum Er concentration differed from the excitation wavelength indicating a different UC mechanism. Importantly, the optimum amount of the V ~(5+) co-doping into the Y _(2) BaZnO _(5) :Er ~(3+) phosphors intensified the UC intensity by more than 3 fold. The Y _(2) BaZnO _(5) :Er ~(3+) ,V ~(5+) phosphor exhibited intense yellowish UC pumped by an 808 nm laser and will have potential applications for in vivo biological labelling, and biomedical imaging and therapies.
机译：Y _（2）BaZnO _（5）的微胶囊：通过使用柠檬酸作为螯合剂的简单水热法成功地制备了ER〜（3+）纳米晶。球形微胶囊的尺寸在1-5μm之间变化，壁厚约为50-100nm。使用气泡辅助的OSTWALD成熟方法讨论了潜在的微胶囊形成机制。 y_（2）bazno _（5）：ER〜（3+）微胶囊在双激光泵送下，在808nm和980nm下，具有激烈的淡黄橙色的特征上变化（UC）排放。 。浓缩依赖性研究表明，550nm和660nm处的激性UC的最佳ER〜（3+）浓度分别为5摩尔％和7mol％。另外，最佳ER浓度与指示不同UC机制的激发波长不同。重要的是，V〜（5+）的最佳量为Y _（2）BaZnO _（5）：ER〜（3+）磷光体将UC强度增强超过3倍。 y_（2）bazno _（5）：ER〜（3+），V〜（5+）磷光体显示出由808nm激光泵浦的强烈黄色的UC，并且将具有体内生物标记和生物医学成像的潜在应用和疗法。

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