and/or samariumdopingwasdonebyaddingCuO,SnO,and/or
Sm2O3 quantitiesinmol%,inrelationtonetworkformerP2O5.
Samples preparedforthepresentstudyare(referredtoas):glass
host (undopedglasssystem);CuSnglass(10%ofeachCuOandSnO
added); CuSn–Sm (10%ofeachCuOandSnO,and2%Sm2O3
added); andSmglass(2%Sm2O3 added). Thecompositionsof
the glassesaresummarizedin Table1. Allglasseswerecutand
polished inordertoproduceglassslabsforopticalmeasurements
with final thicknessesofabout1.0mm.ACuSn–Sm glasssample
wasfurthersubjectedtoHTat500 1C for40min.
Optical absorptionmeasurementswereperformedusinga
Perkin-Elmer 35ultraviolet(UV)/visibledouble-beamspectro-
photometer.Allabsorptionspectrawererecordedwithairas
reference.Photoluminescencespectraandemissiondecaycurves
wereobtainedwithaPhotonTechnologyInternationalQuanta-
Master 30spectrofluorometerequippedwithaXenon flash lamp
havingapulsewidthofabout2 ms (L4633,HamamatsuPhotonics
K.K.) andaphotomultipliertube(R1527P,HamamatsuPhotonicsK.
K.). Emissionandexcitationspectrawereacquiredwiththe flash
lamp operatingatafrequencyof125Hzwiththetotalperiodof
data collectionsetto8ms.Thestepsizeusedforallspectral
acquisitionswas1nm.AllPLmeasurementswererecordedwith
samples mountedinasolidsampleholderatanangleof401 with
particular attentiongiventokeepconditionsconstantduring
experiments.Solid-state 31P NMRanalyseswereperformedwith
an AgilentVNMRS500MHzNMRspectrometerequippedwitha
3.2 mmT3NBHXYprobe.Thespinratewas15kHzandthe
Larmor frequency202.28MHz.Kel-Frotorswereusedforsample
preparation.Chemicalshiftsarerelativetoa85%H3PO4 solution at
0 ppm.Allmeasurementswerecarriedoutatroomtemperature