Photoluminescence properties, excellent thermal stability and energy transfer in Ce3+ and Tb3+ co-doped Sr3Gd2(BO3)4 phosphors

Near ultraviolet light excitable highly efficient blue-green multicolour warwickite phosphor, ScCaO(BO3):Ce3+, Tb3+

“…27,28 In particular, borates containing alkali earth and rare earth elements such as Ba 3 Y 2 (B 2 O 5 ) 3 , Sr 3 Gd 2 (BO 3 ) 4 , NaBaY(BO 3 ) 2 , and Sr 2 LiScB 4 O 10 are adopted as Ce 3+ , Tb 3+ co-doped multicolour phosphor hosts because their crystal structures consist of some substitutional sites for Ce 3+ and Tb 3+ . [29][30][31][32] We focused on ScCaO(BO 3 ) (SCBO) crystal structure that was first reported by Ma et al from the single crystal X-ray diffraction, which is in agreement with warwickite such as MgScO(BO 3 ), YCaO(BO 3 ), and Mg 0.76 Mn 1.24 O(BO 3 ), respectively. [33][34][35][36] The warwickite structure is composed of two disordered octahedral sites containing divalent (M 2+ ) and trivalent (M 3+ ) metal ions.…”

“…27,28 In particular, borates containing alkali earth and rare earth elements such as Ba 3 Y 2 (B 2 O 5 ) 3 , Sr 3 Gd 2 (BO 3 ) 4 , NaBaY(BO 3 ) 2 , and Sr 2 LiScB 4 O 10 are adopted as Ce 3+ , Tb 3+ co-doped multicolour phosphor hosts because their crystal structures consist of some substitutional sites for Ce 3+ and Tb 3+ . 29–32…”

A Lewis acid–base paired InBO3 catalyst: synthesis and high selectivity for isopropanol dehydrogenation

“…Metal borates possess great structural diversity, which is due to the abundant modes of connectivity between the BO 3 and BO 4 anion groups as well as their combinations with metal cations that have different valence states and radii. 1–3 This diverse structural chemistry leads to various applications for metal borates, particularly in nonlinear optics and photoluminescence, 4–7 while their application as solid catalysts has been insufficiently investigated. This great structural diversity may allow the existence of exposed metal cations with an unsaturated coordination environment, sites which are usually active in heterogeneous catalysis, for example by adsorbing substrate molecules or activating oxidative species.…”

Pressure-sensitive Ce3+ photoluminescence in LiCaY5(BO3)6: high internal quantum yields and energy transfer to Tb3+

“…Moreover, Ce 3+ is a frequently used sensitizer, transmitting partial excitation energy to co-activators. 10,11 For example, Ce 3+ -to-Tb 3+ energy transfer has been reported in Sr 3 Gd 2 (BO 3 ) 4 , BaLu 2 Si 3 O 10 and Ba 2 Y 5 B 5 O 17 , where the internal quantum yields (IQYs) are as high as 58%, 71%, and 76%, respectively. 10–12…”

“…Such a high value of IQY is rarely reported in the literature (see Table 1). 10–23 A trial to combine this optimal phosphor with the 310 nm LED chip leads to green emission, indicating its potential as the LED-pumped green phosphor. Most importantly, in situ high-pressure photoluminescence of LiCa(Y 0.99 Ce 0.0.1 ) 5 (BO 3 ) 6 up to 20.1 GPa exhibits a high susceptibility of d λ max /dP = 2.05 nm/GPa, where λ max is the wavelength at the maximal emission intensity.…”