Tunable color emission and solid solubility limit in Ba1−xCaxAl2O4:Eu0.0012+ phosphors through the mixed states of CaAl2O4 and BaAl2O4

Structure and luminescence properties of SrAl2O4:Eu2+, Dy3+ by Ba2+ and Ca2+ co-doping

“…The distortion arises from a size mismatch between the doped and the substituted ions in the host matrix [20]. In the case of SAM4, SAM5 and SAM6, an anamorphic crystal lattices will result, when the surroundings of Eu 2+ ions is changed and thus the emission and excitation characteristics do not match with pure phases reported by other researchers shown in Table 2 [7,16,21]. Moreover, the emission characteristics of CaAl 2 O 4 are also reflecting as weak emission in Fig.…”

“…In Ref. [16], the CaAl 2 O 4 phase will be generated if the Ba:Ca ratio is higher than 0.6:0.4 in the raw materials. In this study, the Ca 2+ and Ba 2+ are doped equally, so CaAl 2 O 4 phase exists in SAM5 and SAM6, respectively.…”

“…[7] 517 443 Ref. [16] 430 500 Ref. [20] 430 processes contain a rapid-decaying process and a slow-decaying one.…”

The photoluminescence properties of Ba0.95−M B8O13:Eu3+ (M = Ca, Sr, 0 ≤x≤ 0.1) in 100–400 nm regions

“…When the Ca 2+ replaced the Ba 2+ partially in the host lattices of BaB 8 O 13 :Eu 3+ , the excitation intensity was decreased and the CT band shifted to higher energy side. The fact would be due to that the cation structures of borate have an influence on the electron transfer and the energy of the CT band of Eu 3+ would be affected [11,12]. It is known that the ionic radius of Ca 2+ , Sr 2+ , Ba 2+ are 0.106, and 0.127, 0.15 nm [13][14][15], respectively, and Sr 2+ is well matched with the Ba 2+ , but Ca 2+ showed the larger radius difference compared with Ba 2+ .…”

Chromaticity of inhomogeneous broadening effect on CaxSr1−xAl2O4:Eu2+ phosphors

“…Recently, the preparation of phosphor materials for UV-LED used as an illumination light source has become an important issue because Eu 2+ -doped crystals have considerable potential as chromaticity tunable phosphor [1][2][3][4][5]. A singe phosphors of Ca 0.5 Sr 0.5 Al 2 O 4 :Eu 2+ crystals powders applied to the UV-near white luminescence was investigated in this study.…”