Up-conversion of 980 nm light into white light from sol-gel derived thin film made with new combinations of LaF3:Ln3+ nanoparticles
Up-conversion of 980 nm light into white light from sol-gel derived thin film made with new combinations of LaF3:Ln3+ nanoparticles
复制标题
DOI：
10.1039/b818397j
复制
发表时间：
2009-04
影响因子：
--
通讯作者：
S. Sivakumar;J. Boyer;E. Bovero;F. V. Veggel
中科院分区：
文献类型：
--
作者：
S. Sivakumar;J. Boyer;E. Bovero;F. V. Veggel
白色光是由二氧化硅和氧化锆溶胶-凝胶薄膜与四种不同的组合的镧系元素掺杂的纳米粒子。当与我们先前的薄膜相比时，从用组合2（Yb/Tm和Yb/Er）纳米颗粒制成的二氧化硅薄膜观察到白色发光强度增加33倍，其中国际照明委员会（CIE）坐标为0.30、0.34。在此样品中的绿色Er 3+发射的绝对量子产率为0.1%，通过使用积分球的绝对方法确定。量子产率被定义为发射的光子除以吸收的光子，因此对于单光子过程，它从0到100%，对于双光子过程，从0到50%，等等。（Yb/Tm、Yb/Ho和Yb/Er），组合3（Yb/Tm、Yb/Tb和Yb/Er）和组合4（Yb/Tm、Yb/Tb和Yb/Eu）纳米颗粒也产生白色光，与我们先前的薄膜相比具有更高的效率。用这些新的纳米颗粒组合制成的ZrO 2薄膜也显示出白色光效率的类似增加。
White light was generated from SiO2 and ZrO2 sol-gel thin films made with four different combinations of lanthanide-doped nanoparticles. A 33-fold increase in the white light emission intensity was observed with the Commission Internationale de I'Eclairage (CIE) co-ordinates of 0.30, 0.34 from a silica thin film made with combination 2 (Yb/Tm and Yb/Er) nanoparticles when compared to our previous thin film. An absolute quantum yield of 0.1% for the green Er3+ emissions in this sample was determined by an absolute method using an integrating sphere. The quantum yield is defined as photons emitted divided by photons absorbed, so it runs from 0 to 100% for one-photon processes, from 0 to 50% for two-photon processes, etc. Similarly, silica thin films made with combination 1 (Yb/Tm, Yb/Ho, and Yb/Er), combination 3 (Yb/Tm, Yb/Tb, and Yb/Er) and combination 4 (Yb/Tm, Yb/Tb, and Yb/Eu) nanoparticles also produced white light with higher efficiency when compared to our previous thin film. ZrO2 thin films made with these new combinations of nanoparticles also showed similar increases in the efficiency of white light.