Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India.
Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Mar 25;122:93-9. doi: 10.1016/j.saa.2013.11.032. Epub 2013 Nov 16.
A series of Dy(3+)/K(+) doped calcium tungstate phosphors were synthesized by solid state reaction method. The crystal structure, surface morphology, chemical composition and photoluminescence properties of the prepared phosphors were investigated. The luminescence decay curves of doped/codoped phosphors were recorded. The X-ray diffraction analysis shows that the phosphors are of tetragonal structure. SEM studies confirm the particle size in the micro-meter (μm) range. The photoluminescence results indicate that these phosphors could be efficiently excited by the near-ultraviolet radiation which causes the emission in the blue and yellow regions. The white light was achieved by tailoring this yellow to blue ratio varying the Dy(3+)/K(+) dopant concentration. The quality of emitted white light was checked by calculating different CIE parameters of these phosphors. Decay kinetics studies confirms the life time of activator ions in micro-second (μs) range.
通过固相反应法合成了一系列 Dy(3+) / K(+)掺杂的钙钨酸盐荧光粉。研究了所制备荧光粉的晶体结构、表面形貌、化学组成和光致发光性能。记录了掺杂/共掺杂荧光粉的荧光衰减曲线。X 射线衍射分析表明，这些荧光粉具有四方结构。SEM 研究证实了微米（μm）范围内的颗粒尺寸。光致发光结果表明，这些荧光粉可以被近紫外辐射有效地激发，从而在蓝色和黄色区域产生发射。通过调整 Dy(3+) / K(+)掺杂浓度来改变黄色到蓝色的比值，可以实现白光。通过计算这些荧光粉的不同 CIE 参数来检查发射白光的质量。衰减动力学研究证实了激活剂离子在微秒（μs）范围内的寿命。
