Determination of the solid solubility of SrAl2o4 in CaAl2o4 through crystal field-dependent Eu2+ signatures

Characterizations of Eu, Dy co-doped SrAl2O4 phosphors prepared by the solid-state reaction with B2O3 addition

“…The transition temperature between them is around 650 • C [1]. There are many processes can be used to prepare the SrAl 2 O 4 phosphor, e.g., solid-state reaction [2], sol-gel method [3], combustion process [4] and Pechini process [5]. B 2 O 3 is a well-known glass former, which has a low melting point around 460 • C. It is regarded as an excellent flux to facilitate the material diffusion.…”

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

“…4, four groups of lines were observed at about 588, 592, 612 and 651 nm. These lines are attributed to the 5 D 0 -7 F J (J = 1, 2, 3) transitions of Eu 3+ in the host, respectively, and the emission intensity of Sr 2+ incorporated BaB 8 13 , the line of the 5 D 0 -7 F 2 transition at about 612 nm has the strongest intensity, which shows that Eu 3+ occupies a crystallographic site without inversion symmetry. But for Ca 2+ incorporated BaB 8 O 13 :Eu, the main emission line is region at 588 nm due to the 5 D 0 -7 F 1 transition of Eu 3+ .…”

“…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+ . It is known that the substitution with different ionic radius will bring the distortion of host lattice.…”

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.…”

“…The inhomogeneous effect was used to explain the broad band emission of Eu 2+ -doped Ca 0.5 Sr 0.5 Al 2 O 4 crystal calcined in reductive atmosphere. Consequently, Eu 2+ ions are expected to preferentially occupy Ca 2+ /Sr 2+ sites due to the valence and radius (Ca 2+ , Sr 2+ , Eu 2+ are 0.106, 0.127, 0.113 nm) [3,7,8].…”