Simultaneous Influence of Dual Sensitizers on Photo-Physical Properties of Dy 3+ Activated YVO 4 Phosphor S

Dual sensitized phosphors owing to their efficient energy transfer and wide spectral range have grabbed the attention of the scientific community to sort out the issue of poor luminous efficacy and simultaneously improve their applicability. Herein, a series of doubly sensitized (Bi 3+ /Mn 2+ ) and Dy 3+ activated YVO 4 phosphors have been synthesized adopting the high temperature solid state reaction route and characterized through various analytical techniques. The tetragonal zircon type structure is confirmed from the XRD patterns supported by quantitative Reitveld refinement. The emission spectral profile reveals a wide spectral range of Dy 3+ covering blue, green and red region with two-fold enhancement in the luminescence intensity due to double sensitization by Bi 3+ /Mn 2+ . The underlying energy transfer mechanism is also discussed in detail to showcase the dual sensitization of the activator ions. The CIE coordinates indicate the spectral tuning towards the white region and the low color purity percentage shows its purity towards white color. Furthermore, the CCT value favours cool white feature of the phosphor. Thus, Bi 3+ and Mn 2+ doping reflects in enhancing the emission intensity, thereby increasing the applicability of these Dy 3+ activated phosphors in the field of solid state lighting.