CaMoO4:RE3+,Yb3+,M+ phosphor with controlled morphology and color tunable upconversion |
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| Affiliation: | 1. Department of Advanced Technology Fusion, Saga University, Honjo-1, Saga 840-8502, Japan;2. GBRY Co. Ltd., 1-62-6-201 Higashiyama, Hirakata City, Osaka 573-1114, Japan;1. Department of Physics, National Institute of Technology, Raipur, 492 010, Chhattisgarh, India;2. School of Studies in Electronics and Photonics, Pt. Ravishankar Shukla University, Raipur, 492 010, Chhattisgarh, India;3. Department of Physics, Shri Shankaracharya Institute of Professional Management and Technology, Raipur, 492 015, India;1. Faculty of Chemical Technology and Engineering, UTP University of Technology and Life Sciences in Bydgoszcz, Seminaryjna 3, Bydgoszcz, 85-326, Poland;2. Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, Poznań, 61-614, Poland;1. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;2. Hybrid Interface Materials Global Frontier Research Group, Pusan National University, Busan 609-735, Republic of Korea;1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India;2. Center for Converging Technologies, University of Rajasthan, Jaipur 302 005, India;3. Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India;4. C. N. R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572 103, India;1. Jazan University, Physics Department, P.O. Box 114, 45142 Jazan, Saudi Arabia;2. Laboratoire de Physique des Couches Minces et Matériaux pour l′Electronique, Université d′Oran 1, Ahmed Ben Bella, BP 1524, El M′naouar, 31000 Oran, Algeria;3. Manisa Celal Bayar University, Education Faculty, Primary School Science Teaching, Demirci-Manisa, Turkey;4. Manisa Celal Bayar University, Hasan Ferdi Turgutlu Technology Faculty, Mechatronics Engineering, Turgutlu, Manisa, Turkey;5. Manisa Celal Bayar University, Faculty of Arts and Sciences, Physics Department, Muradiye, Manisa, Turkey;6. Museo Nacional Ciencias Naturales, Jose Gutierrez Abascal 2, Madrid 28006, Spain;7. Nigde Omer Halis Demir University, Faculty of Arts and Sciences, Physics Department, Nigde, Turkey |
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| Abstract: | CaMoO4:RE3+,Yb3+ (RE = Er, Ho, Tm) phosphors were successfully synthesized by a facile hydrothermal method. XRD patterns confirmed tetragonal structure under different RE3+ and M+ ions doping conditions. Particles shapes and sizes were confirmed by SEM and TEM analyses. Particles shape and size were well tuned by control of solution pH; spherical balls consisting of nano-grains at low pH of ∼2, rice grain shapes at moderate pH of ∼6, and thin flakes at higher pH of ∼12, were observed. Fine tunability of upconversion (UC) emission color was achieved by doping multiple RE3+ ions within a single CaMoO4 host. Blue, green and orange upconverted emission were observed by doping Tm3+, Er3+ and Ho3+ in the CaMoO4, respectively. Further, the emission colors were well tuned by the combination of Tm, Er and Ho ions and their concentrations. CaMoO4:Tm3+,Ho3+,Yb3+ exhibited perfect white emission with well tunability from cool white to warm white colors. Substitution of part of Ca ions by M+ (M = Li, Na, K, Rb) ions affected the crystal field symmetry around RE3+ ions and hence changed the transition probabilities between their f–f transition levels, consequently intensified the UC intensities. The blue (Tm3+), green (Er3+), and orange (Ho3+) upconversion intensities of CaMoO4:RE3+,Yb3+,0.10 K+ phosphors increased by 60, 50 and 40 folds compared to the unsubstituted analogues, respectively. The K substituted CaMoO4:RE3+,Yb3+,K+ phosphors exhibited intense UC emissions visible by naked eye even pumped by less than 1 mW laser power and can have potential application in displays and variety of other applications. |
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| Keywords: | Upconversion Nanomaterials Hydrothermal synthesis Multicolor Displays White emission |
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