期刊
DYES AND PIGMENTS
卷 147, 期 -, 页码 16-23出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.07.065
关键词
Self-activated; WLEDs; Luminescence; Phosphors; Vanadates
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2017R1A2B4011998]
- National Research Foundation of Korea [22A20130012188, 2017R1A2B4011998] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Self-activated Eu3+-doped Ca2NaZn2(VO4)(3) multicolor-emitting phosphors were prepared by a facile critic-assisted sol-gel technique. Both the photoluminescence (PL) excitation and three-dimensional PL emission spectra revealed that the synthesized samples exhibited an intense absorption band in the range of 250-370 nm. The emission intensity of the phosphors was greatly dependent on the doping concentration and the optimal value was found to be 7 mol%. The concentration quenching mechanism is attributed to the dipole-dipole interaction and the critical distance is 18.8 angstrom. With the addition of Eu3+ ions, multicolor emissions were observed in the resultant phosphors when excited at 290 nm. The thermal stability of phosphors was characterized by temperature-dependent PL emission spectra. By manipulating the temperature, the emitting color of the prepared phosphors was tuned from yellowish red to orange, and ultimately to pure red. Additionally, the near-ultraviolet (NUV) chip-based light-emitting diode device, which was fabricated by coating the blended resultant phosphors, commercial blue-emitting and green-emitting phosphors on the NUV chip, emitted glaring warm white light with superior color rendering index and impressive correlated color temperature. These results suggest that the self-activated Eu3+-doped Ca2NaZn2(VO4)(3) multicolor-emitting phosphors are suitable for safety sign in high temperature circumstance and indoor lighting. (C) 2017 Elsevier Ltd. All rights reserved.
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