Synthesis and optical characterization of Dy3+ doped barium alumino silicate phosphor

Luminescence investigation of CaY2Al4SiO12:Dy3+ phosphor synthesized by sol–gel method

“…In this range, four excitation peaks at 327 nm ( 6 H 15/2 → 6 P 3/2 ), 350 nm ( 6 H 15/2 → 6 P 7/2 ), 364 nm ( 6 H 15/2 → 6 P 5/2 ), and 387 nm ( 6 H 15/2 → 4 I 13/2 ) were located. The maximum intensity in the excitation spectra was obtained at 350 nm and attributed to the 6 H 15/2 → 6 P 7/2 transition associated with the Dy 3+ ion (Figure 5a) [14]. Therefore the emission spectra of all samples were monitored at an excitation wavelength of 350 nm [12–14].…”

“…The maximum intensity in the excitation spectra was obtained at 350 nm and attributed to the 6 H 15/2 → 6 P 7/2 transition associated with the Dy 3+ ion (Figure 5a) [14]. Therefore the emission spectra of all samples were monitored at an excitation wavelength of 350 nm [12–14]. Figure 5b shows the excitation spectra of the CaY 2 Al 4 SiO 12 :xDy 3+ phosphor with variation in the dopant Dy 3+ concentration.…”

“…The correlated colour temperature (CCT) of the prepared phosphor was estimated using the following expression [14–19]: where n (inverse line slope) = ( x − x e )/( y − y e ) and ( x e , y e ) = (0.332, 0.186) are the CCT epicentre. The calculated CCT values for the CaY 2 Al 4 SiO 12 : xDy 3+ phosphors revealed a cool white light appearance.…”

“…Thermoluminescence characteristics were studied using a Nucleonix 1009I TL reader. ion (Figure 5a) [14]. Therefore the emission spectra of all samples were monitored at an excitation wavelength of 350 nm [12][13][14].…”

“…ion (Figure 5a) [14]. Therefore the emission spectra of all samples were monitored at an excitation wavelength of 350 nm [12][13][14]. The concentration quenching effect for the Dy 3+ ions was investigated from the following Equation (1), using Dexter's energy transfer (ET) formula and Reisfeld's approximation:…”