Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 695, Issue -, Pages 2745-2750Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.11.196
Keywords
Luminescence; w-LEDs; Phosphor; Eu3+; Solid-solution
Categories
Funding
- Natural Science Foundation of China [21601081]
- Program Foundation of the second batch of innovation teams of Guangzhou Bureau of Education [13C04]
- Scientific Research Project of Guangzhou Municipal Colleges and Universities [1201431340, 1201410618]
- Innovation Training Project of College Students in Guangzhou University [201511078032]
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Developing high brightness, high color purity and thermal stable red phosphors has gained an increasing attention for enhancing the performance of white light emitting diodes (w-LEDs). Herein, a series of red-emitting KBaY1-xEuxSi2O7 (0 < x < 1) solid-solution phosphors were designed and fabricated. The phosphors can be excited by 394 nm near-UV light and emit red light peaking at 612 nm due to the D-5(0) -> F-7(2) transition of Eu3(+). The increasing proportion of Eu3(+) in the solid-solution system can improve the photoluminescence intensity and thermal stability of the phosphors continuously until the Eu3(+) concentration comes to 100%, while no deformation of the crystal structure has been brought. The as-prepared KBaEuSi2O7 phosphor shows excellent thermal photoluminescence stability, its emission integrated intensity can still maintain similar to 90% of the initial value at room temperature when heating to 180 degrees C. The CIE coordinates (0.652, 0.348) of KBaEuSi2O7 phosphor are very close to the NTSC (National television system committee) standard red chromaticity (0.67, 0.33), and the color shift at high temperature is very slight. The KBaEuSi2O7 phosphor can be regarded as a promising red luminescence candidate for w-LEDs. (C) 2016 Elsevier B.V. All rights reserved.
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