Photoluminescence properties and ultra-fast decay profiles of nanoparticles in sol–gel zirconia thin films xZrO2·100−x Cds : Mn2+ and Eu3+
Photoluminescence properties and ultra-fast decay profiles of nanoparticles in sol–gel zirconia thin films xZrO2·100−x Cds : Mn2+ and Eu3+
复制标题
溶胶-凝胶氧化锆薄膜中纳米粒子的光致发光特性和超快衰减曲线xZrO2·100−x Cds：Mn2+和Eu3+
DOI：
10.1016/s0022-2313(01)00275-7
复制
发表时间：
2001
影响因子：
3.6
通讯作者：
M. Herren
中科院分区：
文献类型：
--
作者：
M. Morita;M. Baba;H. Fujii;D. Rau;M. Yoshita;H. Akiyama;M. Herren
采用溶胶-凝胶法制备了掺杂半导体纳米晶xZrO 2·100−x CdS：Mn 2+和Eu 3+（x=20，50，80）的氧化锆薄膜，通过测量10 ~ 300 K温度范围内的发光、时间分辨发光、激发光谱和衰减曲线，对薄膜的发光中心进行了分类.在24-13× 103 cm − 1范围内的宽发射带由四个光谱分量组成，分别是带边发射（CdS）、配体-金属电荷转移（LMCT）中心（ZrO 2）、表面束缚深中心和晶格束缚d-d（Mn 2+）或f-f跃迁（Eu 3+）中心。Mn ~（2+）和Eu ~（3+）的发光光谱与x组分有关，在10 K时寿命缩短到5-50μs。在室温下，在薄膜中也检测到0.5-1.5ns的超快衰减分量。掺杂CdS纳米晶体的发光特性的特点是依赖于退火温度，非常快的衰减时间和低的热激活能1300 cm − 1相比，散装晶体。
Thin zirconia films doped with semiconductor nanocrystals xZrO2·100−x CdS:Mn2+and Eu3+(x=20, 50, 80) were prepared by sol–gel method to classify emission centers by measurements of luminescence, time-resolved luminescence, excitation spectra and decay profiles in the temperature range between 10 and 300K. The broad emission band over the 24–13×103cm−1is found to be composed of four spectral components due to band-edge emission (CdS), ligand to metal charge transfer (LMCT) center (ZrO2), surface-bound deep centers, and lattice-bound d–d (Mn2+) or f–f transition (Eu3+) centers. Luminescence of Mn2+and Eu3+showed x-composition-dependent spectral profiles and shortening of lifetimes to 5–50μs at 10K. Ultra-fast decay components of 0.5–1.5ns were also detected in thin films at room temperature. Luminescence properties of doped-CdS nanocrystals are characterized by dependence on annealing temperatures, very fast decay times and low thermal activation energy of 1300cm−1in comparison with bulk crystals.