(Y,Tb,Eu)2O3 monospheres for highly fluorescent films and transparent hybrid films with color tunable emission
(Y,Tb,Eu)2O3 monospheres for highly fluorescent films and transparent hybrid films with color tunable emission
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DOI：
10.1039/c5ra04665c
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Sun, Xudong
中科院分区：
文献类型：
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作者：
Zhu, Qi;Xiong, Mei;Sun, Xudong
（Y,Tb,Eu）(2)O-3单球（直径约180 nm）由尿素基均相沉淀法合成的前驱体煅烧而成，用作高荧光薄膜的构建块和透明聚合物薄膜的分散填料。在270 nm紫外光激发下，氧化球在543 nm处同时显示出Tb3+的绿色发射和Eu3+在614 nm处的红色发射，并且随着Tb含量的增加，发射颜色可以从红色到黄色再到绿色进行精细调节。Tb3+ -> Eu3+的能量转移效率与（Y0.95Tb0.02Eu0.03）(2)O-3相似，为51.7%。自组装氧化物单球制备出致密的荧光膜，其透过率>= 80% （600-850 nm区域），发射强度是粉末形式的6.8倍。同时，溶液浇铸制得分散在单球中的透明PVA薄膜，具有良好的柔韧性、高透光率（>= 80%）（450 ~ 850 nm区域）和多色发射。这项工作的结果可能对柔性发光器件、封装和能量转换材料具有广泛的意义。
(Y,Tb,Eu)(2)O-3 monospheres (similar to 180 nm in diameter), calcined from the precursors synthesized via urea-based homogeneous precipitation, were employed as the building blocks for highly fluorescent films and as the dispersion fillers for transparent polymer films. The oxide spheres, consisting of similar to 40 nm grains, simultaneously displayed the green emission of Tb3+ at 543 nm and the red emission of Eu3+ at 614 nm under 270 nm UV excitation, with the emission color finely tunable from red to yellow and then to green by increasing the Tb content. The efficiency of Tb3+ -> Eu3+ energy transfer was found to be similar to 51.7% for (Y0.95Tb0.02Eu0.03)(2)O-3. Self-assembling the oxide monospheres produced close-packed phosphor films with transmittance >= 80% (600-850 nm region) and an emission intensity similar to 6.8 times that of the powder form. Meanwhile, solution casting yielded transparent PVA films dispersed with the monospheres, which exhibit outstanding flexibility, high transmittance of >= 80% (450-850 nm region), and multi-color emission. The outcomes of this work may have wide implications for flexible luminescent devices and packaging and energy conversion materials.