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Nanocomposite Phosphor Consisting of CaI2:Eu2+ Single Nanocrystals Embedded in Crystalline SiO2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acsami.7b14132 Hisayoshi Daicho 1 , Takeshi Iwasaki 1 , Yu Shinomiya 1 , Akitoshi Nakano 2 , Hiroshi Sawa 2 , Wataru Yamada 2 , Satoru Matsuishi 3 , Hideo Hosono 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acsami.7b14132 Hisayoshi Daicho 1 , Takeshi Iwasaki 1 , Yu Shinomiya 1 , Akitoshi Nakano 2 , Hiroshi Sawa 2 , Wataru Yamada 2 , Satoru Matsuishi 3 , Hideo Hosono 3
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High luminescence efficiency is obtained in halide- and chalcogenide-based phosphors, but they are impractical because of their poor chemical durability. Here we report a halide-based nanocomposite phosphor with excellent luminescence efficiency and sufficient durability for practical use. Our approach was to disperse luminescent single nanocrystals of CaI2:Eu2+ in a chemically stable, translucent crystalline SiO2 matrix. Using this approach, we successfully prepared a nanocomposite phosphor by means of self-organization through a simple solid-state reaction. Single nanocrystals of 6H polytype (thr notation) CaI2:Eu2+ with diameters of about 50 nm could be generated not only in a SiO2 amorphous powder but also in a SiO2 glass plate. The nanocomposite phosphor formed upon solidification of molten CaI2 left behind in the crystalline SiO2 that formed from the amorphous SiO2 under the influence of a CaI2 flux effect. The resulting nanocomposite phosphor emitted brilliant blue luminescence with an internal quantum efficiency up to 98% upon 407 nm violet excitation. We used cathodoluminescence microscopy, scanning transmission electron microscopy, and Rietveld refinement of the X-ray diffraction patterns to confirm that the blue luminescence was generated only by the CaI2:Eu2+ single nanocrystals. The phosphor was chemically durable because the luminescence sites were embedded in the crystalline SiO2 matrix. The phosphor is suitable for use in near-ultraviolet light-emitting diodes. The concept for this nanocomposite phosphor can be expected to be effective for improvements in the practicality of poorly durable materials such as halides and chalcogenides.
中文翻译：
CaI 2：Eu 2+单纳米晶体嵌入晶体SiO 2中的纳米复合荧光粉
在基于卤化物和硫属化物的磷光体中获得了高发光效率，但是由于它们的化学耐久性差，所以它们是不切实际的。在这里，我们报告了一种卤化物基纳米复合磷光体，具有出色的发光效率和足够的耐用性以供实际使用。我们的方法是将CaI 2：Eu 2+的发光单纳米晶体分散在化学稳定的半透明晶体SiO 2基质中。使用这种方法，我们通过简单的固态反应通过自组织成功地制备了纳米复合荧光粉。6 H多型（阈值）CaI 2：Eu 2+的单纳米晶体不仅在SiO 2无定形粉末中而且在SiO 2玻璃板中都可以产生约50nm的直径。纳米复合磷光体是在CaI 2助熔剂效应的影响下在由无定形SiO 2形成的结晶SiO 2中残留的熔融CaI 2固化后形成的。所得纳米复合磷光体在407 nm紫光激发下发出亮蓝光，内部量子效率高达98％。我们使用阴极荧光显微镜，扫描透射电子显微镜和X射线衍射图的Rietveld精细化方法来确认蓝色发光仅由CaI 2：Eu产生2+个单纳米晶体。该磷光体具有化学耐久性，因为其发光位点嵌入了晶体SiO 2基质中。磷光体适用于近紫外发光二极管。可以预期这种纳米复合磷光体的概念对于改善耐用性差的材料（例如卤化物和硫属元素化物）的实用性是有效的。
更新日期：2017-11-15
中文翻译：
CaI 2：Eu 2+单纳米晶体嵌入晶体SiO 2中的纳米复合荧光粉
在基于卤化物和硫属化物的磷光体中获得了高发光效率，但是由于它们的化学耐久性差，所以它们是不切实际的。在这里，我们报告了一种卤化物基纳米复合磷光体，具有出色的发光效率和足够的耐用性以供实际使用。我们的方法是将CaI 2：Eu 2+的发光单纳米晶体分散在化学稳定的半透明晶体SiO 2基质中。使用这种方法，我们通过简单的固态反应通过自组织成功地制备了纳米复合荧光粉。6 H多型（阈值）CaI 2：Eu 2+的单纳米晶体不仅在SiO 2无定形粉末中而且在SiO 2玻璃板中都可以产生约50nm的直径。纳米复合磷光体是在CaI 2助熔剂效应的影响下在由无定形SiO 2形成的结晶SiO 2中残留的熔融CaI 2固化后形成的。所得纳米复合磷光体在407 nm紫光激发下发出亮蓝光，内部量子效率高达98％。我们使用阴极荧光显微镜，扫描透射电子显微镜和X射线衍射图的Rietveld精细化方法来确认蓝色发光仅由CaI 2：Eu产生2+个单纳米晶体。该磷光体具有化学耐久性，因为其发光位点嵌入了晶体SiO 2基质中。磷光体适用于近紫外发光二极管。可以预期这种纳米复合磷光体的概念对于改善耐用性差的材料（例如卤化物和硫属元素化物）的实用性是有效的。
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