Photoluminescence properties and application of yellow Ca0.65Si10Al2O0.7N15.3:xEu2+ phosphors for white LEDs |
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| Affiliation: | 1. Institute for Scintillation Materials, National Academy of Sciences of Ukraine, Nauki Avenue, 60, 61001, Kharkov, Ukraine;2. Ukrainian Academy of Printing, Pidgolosko Street, 19, 79020, Lviv, Ukraine;3. Ivan Franko National University of Lviv, Kyryla i Mefodiya Street, 8, 79005, Lviv, Ukraine;4. Lviv State Agrarian University, Volodymyra Velykogo Street, 1, 80381, Dublyany, Ukraine;1. Department of Marine Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan, ROC;2. Department of Chemical & Materials Engineering and Graduate Institute of Nanomaterials, Chinese Culture University, Taipei 11114, Taiwan, ROC;3. Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan;4. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan;5. Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan, ROC;1. Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai 625021, India;2. Department of Chemistry, Thiagarajar College of Engineering, Madurai 625015, India;3. Department of Physics, School of Physics, Madurai Kamaraj University, Madurai 625021, India;4. Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram 695551, India;1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia;2. Computational Materials Physics, Vienna University and Center for Computational Materials Science, A-1090 Vienna, Austria |
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| Abstract: | A series of yellow-emitting oxynitride Ca0.65Si10Al2O0.7N15.3:xEu2+ phosphors with α-sialon structure were synthesized. The phase composition and crystal structure were identified by X-ray diffraction and the Rietveld refinement. The excitation and emission spectra, reflectance spectra and thermal stability were investigated in detail, respectively. Results show that Ca0.65Si10Al2O0.7N15.3:0.12Eu2+ phosphors can be efficiently excited by UV-Vis light in the broad range of 290–450 nm and exhibit broad emission spectra peaking at 550–575 nm. The concentration quenching mechanism are discussed in detail and determined to be the dipole-dipole interaction. When the temperature increased to 150 °C, the emission intensity of Ca0.65Si10Al2O0.7N15.3:0.12Eu2+ phosphor is 88.46% of the initial value at room temperature. White LED was fabricated with N-UV LED chip combined with blue Ca3Si2O4N2:Ce3+ and yellow Ca0.65Si10Al2O0.7N15.3:Eu2+ phosphors. The color rendering index and correlated color temperature of this white LED were measured to 78.94 and 6728.12 K, respectively. All above results demonstrate that the as-prepared Ca0.65Si10Al2O0.7N15.3:xEu2+ may serve as a potential yellow phosphor for N-UV w-LEDs. |
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| Keywords: | Oxynitride Phosphor α-sialon w-LEDs |
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