Luminescence and photoconversion properties of micro-powder phosphors based on the Ce3+ and Mn2+ doped Ca2YMgScSi3O12 silicate garnets

This work is dedicated to study the synthesis processes and luminescence properties of micro-crystalline powder phosphors of Ce3+ and Mn2+ doped Ca2YMgScSi3O12 garnets (CYMSSG:Ce and CYMSSG:Ce,Mn) The photoluminescence emission spectra and decay kinetics confirm the formation of Ce3+ multicenters in the CYMSSG:Ce powder phosphor due to local inhomogeneity of the different dodecahedral positions and presence of the energy transfer between high-energy and low energy Ce3+ emission centers in this garnet. The effective Ce3+ to Mn2+ energy transfer process is observed in CYMSSG:Ce, Mn phosphors resulting in the redshift of the emission spectra in comparison with CYMSSG:Ce counterpart. We have shown that CYMSSG:Ce and CYMSSG:Ce, Mn powder phosphors can be used as an efficient photoconverter (PC) for creation of the high-power white LEDs (WLEDs). The prototypes of PC-WLEDs, based on 450 nm emitting blue LED and planar layers of CYMSSG:Ce and CYMSSG:Ce, Mn microcrystalline powder phosphors, embedded in the epoxy resin, were prepared and their photoconversion properties were investigated as well. •Creation of micro-powders Ca2YMgScSi3O12:Ce, Ca2YMgScSi3O12:Ce, Mn and Ca2YMgScSi3O12:Mn using solid-state synthesis.•It is found that Mn2+ ions may either substitute for Ca2+ cations of CYMSSG host and generate the yellow emission band peaked 565 nm and/or substitute for Sc3+ cations to generate the red emission band peaked at 676 nm.•The effective Ce3+ to Mn2+ energy transfer process is observed in CYMSSG:Ce, Mn MP samples resulting in the redshift of the emission spectra to 590 nm in comparison with CYMSSG:Ce counterpart.•Prototype of WLED based on Ca2YMgScSi3O12:Ce, Ca2YMgScSi3O12:Mn, Ce phosphors and blue-chip is created.