Wang Guofeng, Qin Weiping, Zhang Daisheng, Wei Guodong, Wang Lili, Zheng Kezhi, Zhu Peifen, Kim Ryongjin, Ding Fuheng
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
J Nanosci Nanotechnol. 2010 Mar;10(3):1728-32. doi: 10.1166/jnn.2010.2118.
Y(OH)3:Er3+ nanowires were synthesized by a hydrothermal method. Y(OH)3:Er3+ can convert into NH4Y3F10:Er3+ after fluorization, and NH4Y3F10:Er3+ can convert into YF3:Er3+ after being annealed. The structures of obtained Y(OH)3:Er3+, NH4Y3F10:Er3+, and YF3:Er3+ samples were pure hexagonal, cubic, and orthorhombic phase, respectively. Under 378-nm excitation, the three samples showed similar features. The 2H9/2, --> 4I15/2, 4F3/2(4F5/2) --> 4I15/2, and 4S3/2 --> 4I15/2 were observed, and the most intense peak was centered at 436 nm [4F3/2(4F5/2) --> 4I15/2]. Under 980-nm excitation, only the upconversion emissions from NH4Y3F10:Er3+ and YF3:Er3+ were observed. These emissions come from the following transitions: 2H11/2 --> 4I15/2, 4S3/2 --> 4I15/2, and 4F9/2 --> 4I15/2. The upconversion mechanism is discussed in detail.
采用水热法合成了Y(OH)3:Er3+纳米线。Y(OH)3:Er3+氟化后可转化为NH4Y3F10:Er3+，NH4Y3F10:Er3+退火后可转化为YF3:Er3+。所获得的Y(OH)3:Er3+、NH4Y3F10:Er3+和YF3:Er3+样品的结构分别为纯六方相、立方相和正交相。在378 nm激发下，这三个样品表现出相似的特征。观察到了2H9/2→4I15/2、4F3/2(4F5/2)→4I15/2和4S3/2→4I15/2跃迁，最强峰位于436 nm [4F3/2(4F5/2)→4I15/2]处。在980 nm激发下，仅观察到NH4Y3F10:Er3+和YF3:Er3+的上转换发射。这些发射来自以下跃迁：2H11/2→4I15/2、4S3/2→4I15/2和4F9/2→4I15/2。详细讨论了上转换机制。
