Broad luminescence of Ce³⁺in multiple sites in (La,Ce,Y)₆Si₄S₁₇

Abstract

We have developed novel broad luminescent phosphors (La,Ce,Y)6Si4S17 including multiple substituted sites of Ce3+ . They have formed a triclinic structure (P − 1) with three kinds of coordination structures around Ce3+ ions. The broad photoluminescence (PL) spectra at the range from 430 nm to 700 nm were observed, and they can be respectively decomposed into three PL bands. Moreover, the correlation between the three PL bands and the three substitution sites for Ce3+ was confirmed through the PL spectra at 78 K and Van Uitert’s universal equation.

Red persistent luminescence excited by visible light in CaS:Eu2+,Tm3+

“…For the fabrication of CaS : Eu 2+ , Tm 3+ powders, we used solid-state reaction technique in a quartz tube [26][27][28][29]. A mixture of CaS, EuS and Tm 2 S 3 in the atomic ratio of Ca 2+ : Eu 2+ :Tm 3+ = 1:x:0.02 was prepared.…”

Broadband NIR luminescence of Cr3+-doped Mg4Nb2O9 phosphors toward LED light source applications for NIR spectrometry

“…Similar trends in the dependence of the shifting PL peak and broadening of the PLE bandwidth on the luminescent center concentration have often been reported for phosphor materials with multiple luminescent sites. 42) The multi-emission sites and CF parameters Dq/B of Cr 3+ are discussed in Sect. 3.4.…”

Crystal structure of chalcogenides R'xR''yR'''zPbSi2S8 (R' – La, R'' – Tb, R''' – Er)

“…The properties and crystal structure of multi-component chalcogenides and rare earth metals (REM) containing chalcogenides [4][5][6], are investigated systematically regarding their practical utilization [7][8][9][10][11][12]. Adding REM atoms with different chemical nature in terms of 4f electronic level occupancy into the crystal structure of chalcogenides, is a good way to develop semiconductors with desired properties, as such examples are CaY2Si2S8:Ce 3+ [13], BaLa2Si2S8:Eu 2+ [14], (Gd,Ce)4(SiS4)3, (Y,Ce)4(SiS4)3 [15], (La,Ce,Y)6Si4S17 [16], LaR'PbSi2S8, CeR'PbSi2S8, PrR'PbSi2S8 (R' = Ce, Pr, Sm, Tb, Dy, Y, Ho and Er) [17] and others. According to the prospects of chalcogenide phases, which crystal structure consists of REM atoms, we can reasonably confirm that the synthesis of multi-component chalcogenides and detailed investigation of the relationship between their crystal structure and properties can be effectively utilized for designing new advanced functional materials.…”