Structural and photoluminescence characteristics of the single-host green-light-emitting T-phase Ba1.3Ca0.7SiO4: Tb3+ phosphors for LEDs

Photoluminescence processes in τ -phase Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ phosphors for solid-state lighting

“…Herein, the above silicate phosphor was chosen as a host material because of its special τ-phase crystal structure, excellent chemical stability and appropriate energy bandgap (approx. 3.2 eV) [16][17][18]. Note that the single-ion doping effects on this silicate phosphor were reported in our previous works [17,18].…”

“…The crystal structure of Ba 1.3 Ca 0.7 SiO 4 has the hexa-coordinated Ba/Ca sites and the tetrahedral anion group normalSiO44− [24]. Thus, the unit cell environment of Ba 1.3 Ca 0.7 SiO 4 phosphors is similar to the Ba-O and Ca-O crystal coordination [18]. Importantly, the trivalent dopant ions D y 3+ and Tb 3+ may substitute Ca 2+ ions instead of Ba 2+ in the matrix Ba 1.3 Ca 0.7 SiO 4 [16,25–27].…”

“…In order to introduce D y 3+ /Tb 3+ co-dopant ions into the Ba 1.3 Ca 0.7 SiO 4 host, 3.0 mol% of D y 3+ and 1–5 mol% of Tb 3+ have been selected. Stoichiometric amounts of Ba(NO 3 ) 2 , Ca(NO 3 ) 2 .4H 2 O and CH 4 N 2 O were dissolved in 10 ml of deionized water [17,18]. The estimated quantities of D y 3+ and Tb 3+ ions were added to the solution as doping and co-doping ions.…”

“…3.2 eV) [16][17][18]. Note that the single-ion doping effects on this silicate phosphor were reported in our previous works [17,18]. Hence, considering the importance of white-LED development [19][20][21], the Dy 3+ /Tb 3+ 's co-doping effect on the structural, morphological, photoluminescent and other properties of Ba 1.3 Ca 0.7 SiO 4 phosphor were investigated for elucidating the PL processes in τ-phase co-doped Ba 1.3 Ca 0.7-x-y SiO 4 :xDy 3+ /yTb 3+ phosphors, suggesting that these ceramic phosphors are a promising candidate for white-LED and/or laser applications.…”

Single-Phase Silicate Phosphors (Ba1.3Ca0.7−xSiO4:xDy3+) Doped with Dysprosium for White Solid-State Lighting

“…Calcium nitrate (Ca(NO 3 ) 2 4H 2 O (99.9%)), barium nitrate (Ba(NO 3 ) 2 (99.9%)), dysprosium(III) nitrate (Dy(NO 3 ) 3 (99.9%)), urea (CH 4 N 2 O (99.9%)), and tetraethyl orthosilicate (TEOS) ((Si(OC 2 H 5 ) 4 (99.9%)) were purchased from Sigma-Aldrich and used as received. Stoichiometric amounts of nitrates, TEOS, and urea were dissolved in 10 mL of deionized water [35,36].…”