首页|Cool white light and tunable multicolor emission from Tb3+/Dy3+co-activated glasses under different excitations for WLEDs
Cool white light and tunable multicolor emission from Tb3+/Dy3+co-activated glasses under different excitations for WLEDs
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A set of co-doped(Tb3+/Dy3+)lithium zinc borate(LZB)glasses were developed by melt quenching.The structural evaluation was performed for synthesized glassy matrices.The Dy3+and Tb3+individually doped glasses exhibit intense yellow and green luminescence bands at 575 nm(4F9/2 → 6H13/2)and 543 nm(5D4→7F5),respectively.The sensitization effect of Dy3+on Tb3+was analyzed by increasing the Tb3+content with respect to the optimum Dy3+content(0.5 mol％)in Dy3+/Tb3+.The spectral overlay of Dy3+luminescence and Tb3+absorption profiles,Dy3+/Tb3+PL spectra under different excitations 352,362,376,and 385 nm,shortening decay lifetimes of Dy3+in Dy3+/Tb3+co-activated glasses,energy transfer(ET)parameters,chromaticity coordinates and their corresponding correlated temperatures all help to explain ET from Dy3+to Tb3+.At 385 nm of Dy3+excitation,the optimized co-activated(0.5Dy3++1.0Tb3+):LZB glass displays cool white light emission.The non-radiative ET from Dy3+to Tb3+is dominated by electric dipole-dipole interaction and its ET efficiency was calculated to be 63％.At the same time,reverse ET from Tb3+to Dy3+was also analyzed.The shift in color coordinates from dominant yellow to greenish-yellow,green and white light emission suggests that Dy3+/Tb3+co-activated LZB glasses can be a potential candidate for UV converted multicolor and white light emit-ting devices.
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