title: Spectroscopic properties and upconversion studies in Ho(3+) /Yb(3+) Co-doped calcium scandate with spectrally pure green emission.
abstract: The optical properties of a Ho(3+) /Yb(3+) co-doped CaSc2 O4 oxide material are investigated in detail. The spectral properties are described as a function of doping concentrations. The efficient Yb(3+) →Ho(3+) energy transfer is observed. The transfer efficiency approaches 50 % before concentration quenching. The concentration-optimized sample exhibits a strong green emission accompanied with a weak red emission, showing perfect green monochromaticity. The results of the spectral distribution, power dependence, and lifetime measurements are presented. The green, red, and near-infrared (NIR) emissions around 545, 660, and 759 nm are assigned to the (5) F4 +(5) S2 →(5) I8 , (5) F5 →(5) I8 , and (5) F4 +(5) S2 →(5) I7 transitions of Ho(3+) , respectively. The detailed study reveals the upconversion luminescence mechanism involved in a novel Ho(3+) /Yb(3+) co-doped CaSc2 O4 oxide material.
authors: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033 (PR China), Fax: (+86) 431-8617-6317; University of Chinese Academy of Sciences, Beijing, 100039 (PR China).
authors: Jing
authors: J
authors: Li
authors: Jiahua
authors: J
authors: Zhang
authors: Zhendong
authors: Z
authors: Hao
authors: Xia
authors: X
authors: Zhang
authors: Jihong
authors: J
authors: Zhao
authors: Yongshi
authors: Y
authors: Luo
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004735:Energy Transfer; D005456:Fluorescent Dyes / Q000737:chemistry; D006695:Holmium / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D012538:Scandium / Q000737:chemistry*; D013053:Spectrophotometry; D013696:Temperature; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D003035:Cobalt; D015018:Ytterbium; C046254:scandium oxide; D006695:Holmium; D012538:Scandium
keywords: dynamics; energy transfer; fluorescent probes; luminescence; phosphors