Dubey Sumit, Deshmukh Pratik, Satapathy S, Singh M K, Gupta P K
NanoFunctional Materials Laboratory, Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India.
Luminescence. 2017 Aug;32(5):839-844. doi: 10.1002/bio.3260. Epub 2017 Jan 8.
Nanophosphors of (Sr Mg Eu ) SiO (x = 0, 0.18, 0.38, 0.58 and 0.78) were prepared through low temperature solution combustion method and their luminescence properties were studied. The emission peak for Eu -doped Sr SiO nanophosphor is observed at ~490 nm and ~553 nm corresponding to two Sr sites Sr(I) and Sr(II) respectively for 395 nm excitation. However the addition of Mg dopant in Sr SiO leads to suppression of ~553 nm emission peak due to absence of energy levels of Sr (II) sites which results in a single broad emission at ~460 nm. It was shown that the emission peak blue shifted with increase in Mg concentration which may be attributed to change in crystal field environment around Sr(I) sites. Therefore, the (Mg Sr Eu ) SiO nanophosphor can be used for blue emission and the Sr SiO :Eu for green-yellow emission at 395 nm excitations. The Commission International de L'Eclairage (CIE) chromaticity coordinates for mixed powders of (Mg Sr Eu ) SiO and Sr SiO :Eu (in a 1:1 ratio) fall in the white region demonstrating the possible use of the mixture in white light generation using near-UV excitation source.
通过低温溶液燃烧法制备了（SrMgEu）SiO（x = 0、0.18、0.38、0.58和0.78）的纳米磷光体，并对其发光性能进行了研究。对于Eu掺杂的SrSiO纳米磷光体，在395nm激发下，分别对应于两个Sr位点Sr（I）和Sr（II），在490nm和553nm处观察到发射峰。然而，在SrSiO中添加Mg掺杂剂会导致553nm发射峰的抑制，这是由于Sr（II）位点的能级不存在，从而在460nm处产生单一的宽发射。结果表明，发射峰随着Mg浓度的增加而蓝移，这可能归因于Sr（I）位点周围晶体场环境的变化。因此，（MgSrEu）SiO纳米磷光体可用于蓝光发射，而SrSiO:Eu可用于在395nm激发下的绿黄色发射。（MgSrEu）SiO和SrSiO:Eu（1:1比例）混合粉末的国际照明委员会（CIE）色度坐标落在白色区域，表明该混合物在使用近紫外激发源产生白光方面的潜在用途。
