Synthesis and spectral-luminescent properties of La1-xPrxGa0.5Sb1.5O6 solid solutions

Developing and optimizing novel Cr3+-activated inorganic NIR phosphors by combining triple-objective optimization and crystal field engineering

“…59,60 In addition, the DR spectra of both LGS and LGS:0.04Cr 3+ show significant absorption due to matrix defects at about 290 nm, and the absorption is significantly enhanced after doping with Cr 3+ . 61,62 The increase in defects may also affect the thermal stability of LGS: 0.04Cr 3+ .…”

Blackbody emission from CaF2and ZrO2nanosized dielectric particles doped with Er3+ions

“…2,3 In our own studies, 7 we demonstrated that the BBWE arising in Y 1Àx Er x PO 4 (x ¼ 0-1) nanosized dielectric particles under laser excitation with l exc ¼ 970 nm, is thermal. Studies of the features of similar phenomenon in Y (1Àx) Er x VO 4 and La 1Àx Pr x Ga 0.5 Sb 1.5 O 6 (x ¼ 0-1) nanopowders upon their excitation into the absorption bands of Er 3+ and Pr 3+ ions 8,9 also conrmed its thermal nature. The appearance of BBE in the visible spectral range in the compounds studied by us is a result of their strong heating under the impact of intense laser radiation.…”

“…A vivid example is the appearance of broadband "white" emission (BBWE) in nanoscale dielectric materials when they are excited by intense laser radiation. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In most cases, this emission was observed in compounds doped with rare-earth (RE) ions upon excitation into the absorption band of these ions. An analysis of these publications indicates that there are different points of view on the nature of the observed phenomenon and the processes responsible for it.…”

“…According to the mechanism we proposed, in addition to the excitation power density and the concentration of RE ions, the appearance of BBWE in various matrices [7][8][9]14 should be significantly affected by their band gap (E g ), the RE ion absorption value at the excitation wavelength, as well as the presence of structure defects. To clarify proposed mechanism and to identify which of these parameters is dominant, it is necessary to study the features of the BBWE appearance in various nanoscale dielectric materials with RE ions, in which these parameters differ signicantly.…”

“…It should also be noted that in most studies, BBWE was detected in oxide nanosized particles doped with RE under laser excitation. [1][2][3][4][5][6][7][8][9]11,13,14,[24][25][26] To date, we have found only one such study for uoride nanosized particles (for LiYbF 4 compounds). 26 However, studies on the occurrence of BBE in CaF 2 -x mol% ReF 3 compounds were not carried out.…”