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- W2796804989 abstract "Abstract Tunable full-color emitting Na2Ba6(Si2O7) (SiO4)2:Ce3+,Eu2+,Tb3+,Mn2+ phosphors have been prepared and investigated. X-ray diffraction (XRD), photoluminescence (PL) spectra, absolute quantum yield and lifetimes were used to characterize the samples. When doped with Ce3+ or Eu2+ they present blue luminescence under UV excitation. Results of luminescence spectra and decay time measurements reveals that an energy transfer (ET) from Ce3+ to Tb3+ occurred mainly via a dipole–quadrupole mechanism, and the critical distances of the ion pairs (RC) were calculated by the spectral overlap method. The energy-transfer efficiencies of Ce3+ to Eu2+ are discussed in detail. Commission on illumination value of color tumble emission as well as luminescence quantum yield (9.8–42.1%) can be tuned by controlling the content of Ce3+, Tb3+ and Eu2+. A white LED with CIE chromaticity coordinates of (0.30, 0.41), superior color-rendering index (Ra) of 87.5 and correlated color temperature (CCT) of 6518 K was fabricated by combining a 365 nm UV-InGaN chip and a phosphor blend of white-emitting Na2Ba6(Si2O7) (SiO4)2:Ce3+,Eu2+,Tb3+,Mn2+ phosphor. All results suggest that it is suitable for UV white LEDs." @default.
- W2796804989 created "2018-04-24" @default.
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- W2796804989 date "2018-07-01" @default.
- W2796804989 modified "2023-10-18" @default.
- W2796804989 title "Tunable full-color emitting Na2Ba6(Si2O7)(SiO4)2:Ce3+,Eu2+,Tb3+,Mn2+ phosphor for UV white LEDs: Photoluminescence and energy transfer" @default.
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- W2796804989 doi "https://doi.org/10.1016/j.jallcom.2018.04.140" @default.
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