000075370 001__ 75370
000075370 005__ 20191122145056.0
000075370 0247_ $$2doi$$a10.1016/j.solmat.2017.09.031
000075370 0248_ $$2sideral$$a101852
000075370 037__ $$aART-2018-101852
000075370 041__ $$aeng
000075370 100__ $$0(orcid)0000-0003-3480-398X$$aOliete, P. B.$$uUniversidad de Zaragoza
000075370 245__ $$aSelective thermal emission of directionally solidified Al2O3/Y3-xErxAl5O12 eutectics: influence of the microstructure, temperature and erbium content
000075370 260__ $$c2018
000075370 5060_ $$aAccess copy available to the general public$$fUnrestricted
000075370 5203_ $$aDirectionally solidified eutectic rods of Al2O3-Y3-xErxAl5O12 (0 = x = 3) composition have been grown using the laser floating zone method at processing rates of 25 mm/h and 750 mm/h. For all the samples the microstructure presents the same morphology, consisting of an interpenetrated 3D eutectic network of both Al2O3 and garnet phases, while eutectic interspacing strongly depends on the solidification rate. Optical absorption, luminescence and thermal emission have been investigated as a function of the growth rate and the erbium content. From the luminescence characterization it can be concluded that erbium ions are present in the eutectic only in the garnet phase. Near infrared thermal emission has been measured at temperatures ranging from 1000 to 1500 °C. Selective emission consisting of an emission band at 1540 nm and a weaker line at 970 nm, ascribed to the radiative de-excitation of the thermally excited Er3+ ions from the 4I13/2 and 4I11/2 multiplets to the 4I15/2 ground state respectively, has been detected in all the samples containing erbium. The influence of the erbium content, the microstructure and the temperature on the thermal emission has been investigated. The strongest selective emission has been obtained for samples with x=3 although it does not increase proportionally to the erbium content. The thermal emission becomes more intense when the temperature is increased but the selective emission seems to saturate at temperatures higher than 1300 °C. This effect is especially noticeable for x=3 and is attributed to thermally activated non-radiative de-excitation channels. It is suggested that these channels become effective through energy transfer among Er3+ ions and towards killers.
000075370 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2013-41045-R$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2016-77769-R
000075370 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000075370 590__ $$a6.019$$b2018
000075370 591__ $$aENERGY & FUELS$$b14 / 103 = 0.136$$c2018$$dQ1$$eT1
000075370 591__ $$aPHYSICS, APPLIED$$b22 / 148 = 0.149$$c2018$$dQ1$$eT1
000075370 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b48 / 293 = 0.164$$c2018$$dQ1$$eT1
000075370 592__ $$a1.62$$b2018
000075370 593__ $$aElectronic, Optical and Magnetic Materials$$c2018$$dQ1
000075370 593__ $$aSurfaces, Coatings and Films$$c2018$$dQ1
000075370 593__ $$aRenewable Energy, Sustainability and the Environment$$c2018$$dQ1
000075370 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000075370 700__ $$0(orcid)0000-0001-8751-0983$$aOrera, A.$$uUniversidad de Zaragoza
000075370 700__ $$0(orcid)0000-0002-5793-2058$$aSanjuán, M. L.$$uUniversidad de Zaragoza
000075370 700__ $$0(orcid)0000-0003-0747-405X$$aMerino, R. I.$$uUniversidad de Zaragoza
000075370 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000075370 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000075370 773__ $$g174 (2018), 460-468$$pSol. energy mater. sol. cells$$tSOLAR ENERGY MATERIALS AND SOLAR CELLS$$x0927-0248
000075370 8564_ $$s956255$$uhttps://zaguan.unizar.es/record/75370/files/texto_completo.pdf$$yPostprint
000075370 8564_ $$s54378$$uhttps://zaguan.unizar.es/record/75370/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000075370 909CO $$ooai:zaguan.unizar.es:75370$$particulos$$pdriver
000075370 951__ $$a2019-11-22-14:46:17
000075370 980__ $$aARTICLE