Abstract
Various novel SrBi2Ta2O9:Tm3+ blue-emitting materials were achieved via solid-state synthesis. The structure and phase purity of prepared SrBi2Ta2O9:xTm3+ (x = 0.005-0.30 mol) were examined by X-ray powder diffraction. The surface morphology of SrBi2Ta2O9:0.01Tm3+ were studied by scanning electron microscopy. Photoluminescence properties were systematically explored under the monitoring emission (λem = 468 nm) and excitation (λex = 303 nm) spectra. The optimum mole ratio of as-synthesized phosphors was 0.01 mol. The concentration quenching mechanism in the SrBi2Ta2O9 host was due to electric multipole interaction. Particularly, the chromaticity coordinates (0.1334, 0.0474) of SrBi2Ta2O9:0.01Tm3+ are near to those of the commercial BaMgAl10O17:Eu2+. These results validated the SrBi2Ta2O9:Tm3+ phosphor can be utilized good blue-emitting candidate for W-LEDs.
Highlights
To tackle a range of energy and environmental issues, phosphor-converted white-emitting diodes (W-LED) have extensively been getting attention because of energysaving and high luminous efficiency [1,2,3,4,5]
Tm3+-doped SrBi2Ta2O9 blue-emitting phosphor for W-LEDs has been synthesized at 1200 °C in an ambient atmosphere by solidstate reaction
The structural characterization, the concentration quenching, photoluminescence (PLE) properties, the emission PL spectra, and CIE coordinates were investigated in depth
Summary
To tackle a range of energy and environmental issues, phosphor-converted white-emitting diodes (W-LED) have extensively been getting attention because of energysaving and high luminous efficiency [1,2,3,4,5]. WLED are realized by combining the output from blue LED chip with yellow-emitting phosphor Y3Al5O12:Ce3+. These products lacked red composition, which lead to lower color rendering index and high correlated color temperature [6, 7]. An alternative method was proposed by combining tricolor (RGB) phosphors coated onto a near-UV (NUV) chip [8]. Tm3+-doped SrBi2Ta2O9 blue-emitting phosphor for W-LEDs has been synthesized at 1200 °C in an ambient atmosphere by solidstate reaction. The structural characterization, the concentration quenching, photoluminescence (PLE) properties, the emission PL spectra, and CIE coordinates were investigated in depth
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