Photostability of YAG:Ce3+ Nanophosphors Synthesized by Glycothermal Method
Photostability of YAG:Ce3+ Nanophosphors Synthesized by Glycothermal Method
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DOI：
10.1149/1.3327907
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发表时间：
2010-01-01
影响因子：
3.9
通讯作者：
Takashima, Suguru
中科院分区：
文献类型：
--
作者：
Kamiyama, Yusuke;Hiroshima, Takehiko;Takashima, Suguru
钇铝石榴石（YAG）：Ce3+纳米荧光粉由醋酸钇、醋酸铈和异丙醇铝通过一步糖热法制备，即在1,4-丁二醇中于300℃高压灭菌2小时。在蓝色激发光的连续照射下，观察到与Ce3+的5d→4f跃迁相对应的光致发光强度逐渐降低。对于微米尺寸的块体，没有观察到这种光漂白行为。两步糖热合成，即重复的高压釜处理，导致纳米颗粒的生长和结晶度的提高，从而抑制光漂白。与粉末样品相比，由浆料生产的密封透明膜对光漂白的抑制更为显着。电子能量损失光谱证实，光漂白归因于表面原子比例较高的纳米粒子表面附近的 Ce3+ 光氧化为 Ce4+。
Yttrium-aluminum garnet (YAG):Ce3+ nanophosphor powder is prepared from yttrium acetate, cerium acetate, and aluminum isopropoxide by a one-step glycothermal method, i.e., by autoclave treatment in 1,4-butanediol at 300 degrees C for 2 h. The gradual decrease in the intensity of photoluminescence corresponding to the 5d -> 4f transition of Ce3+ is observed under the continuous irradiation of blue excitation light. This photobleaching behavior is not observed for the micrometer-sized bulk. Two-step glycothermal synthesis, i.e., the repeated autoclave treatment, causes the growth of nanoparticles and the improvement of crystallinity, and hence suppresses the photobleaching. The suppression of photobleaching is more prominent for the sealed transparent film produced from the paste compared with the powder samples. The photobleaching is attributed to the photo-oxidation of Ce3+ to Ce4+ near the surface of nanoparticles with a high proportion of surface atoms, as confirmed by electron energy loss spectroscopy.