Print Email Facebook Twitter Thermal ionization and thermally activated crossover quenching processes for 5d-4f luminescence in Y3 A l5-x G ax O12 Title Thermal ionization and thermally activated crossover quenching processes for 5d-4f luminescence in Y3 A l5-x G ax O12: P r3+ Author Ueda, J. (TU Delft RST/Fundamental Aspects of Materials and Energy; Kyoto University; Universiteit Utrecht) Meijerink, Andries (Universiteit Utrecht) Dorenbos, P. (TU Delft RST/Fundamental Aspects of Materials and Energy) bos, A.J.J. (TU Delft RST/Fundamental Aspects of Materials and Energy) Tanabe, Setsuhisa (Kyoto University) Date 2017-01-11 Abstract We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr3+-doped Y3Al5-xGaxO12. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f2:PJ3 states of Pr3+ and the host conduction band (CB). Temperature-dependent luminescence lifetime measurements show that the 5d luminescence quenching temperature T50% increases up to x=2 and decreases with further increasing Ga content. This peculiar behavior is explained by a unique transition between the two quenching mechanisms which have an opposite dependence of thermal quenching on Ga content. For low Ga content, thermally activated crossover from the 4f5d state to the 4f2(PJ3) states is the operative quenching mechanism. With increasing Ga content, the activation energy for thermally activated crossover becomes larger, as derived from the configuration coordinate diagram, while from the vacuum referred binding energy diagram the activation energy of thermal ionization becomes smaller. Based on these results, we demonstrated that the thermal quenching of Pr3+:5d1-4f luminescence in Y3Al5-xGaxO12 with x=0,1,2 is a thermally activated crossover while for x=3,4,5 it results from the thermal ionization. To reference this document use: http://resolver.tudelft.nl/uuid:0b6a41ca-1695-466f-a79c-a71a4c6831c0 DOI https://doi.org/10.1103/PhysRevB.95.014303 ISSN 1098-0121 Source Physical Review B (Condensed Matter and Materials Physics), 95 (1) Part of collection Institutional Repository Document type journal article Rights © 2017 J. Ueda, Andries Meijerink, P. Dorenbos, A.J.J. bos, Setsuhisa Tanabe Files PDF PhysRevB.95.014303.pdf 810.53 KB Close viewer /islandora/object/uuid:0b6a41ca-1695-466f-a79c-a71a4c6831c0/datastream/OBJ/view