Preparation and Investigation of Tm³⁺- Doped Li₃Gd₃Te₂O₁₂ Blue-Emitting Phosphor

Abstract

A novel blue-emitting phosphor, Li3Gd3Te2O12:Tm3+ for white light-emitting diodes (W-LEDs) was prepared by solid-state synthesis and its structure and luminescence properties were investigated. This phosphor shows a satisfactory blue performance (peak at 458 nm) due to the 1D2 → 3F4 transition of Tm3+ excited by 361 nm light. Investigation of Tm3+ content dependent emission spectra indicates that x = 0.03 is the optimum doping content of Tm3+ ions in the Li3Gd3Te2O12 host. The critical distance and the concentration quenching mechanism were also investigated. In particular, the color purity of as-prepared sample is close to that of the commercial blue phosphor BaMgAl10O17:Eu2+ (BAM:Eu2+). The present work suggests that the Li3Gd3Te2O12:Tm3+ phosphor is a potential blue-emitting candidate for the application in the near-UV WLEDs.

Preparation and spectroscopic properties of Ca2MgTeO6:Tm3+ blue-emitting tellurate phosphors

“…3 curve (b) displays the emission spectrum of Ca2MgTeO6:0.02Tm3+ at near-UV light λex = 359 nm. The main emission band at 457 nm due to the electronic dipole transition of 1D2 →3F4 of Tm3+ [15]. Importantly, the blue region's emission peaks suggested that Ca2MgTeO6:Tm3+ can be promising blue-emitting phosphors.…”

“…Rare-earth ions doped tellurates have arisen extensive interest due to excellent chemical and physical stability, such as Li3Gd3Te2O12:Dy 3+ , Ca3TeO6:Eu 3+ , and NaLaCaTeO6:Mn 4+ [10][11][12][13]. Tm 3+ is widely used as an efficient blue light emitting center , such as CaHfO3:Tm 3+ , Li3Gd3Te2O12:Tm 3+ , Ca9NaGd2/3(PO4)7:Tm 3+ , and CaBi4Ti4O15:Tm 3+ ,Yb 3+ many alternative Tm 3+ -doped phosphors have been reported [14][15][16][17]. Ca2MgTeO6 ceramics were reported to a double perovskite family member and exhibited a monoclinic P21/n structure [18].…”

Preparation and luminescence properties of Tm3+-doped SrBi2Ta2O9 blue-emitting phosphor

“…As is well-known, rare-earth ions doped tantalates have arisen extensive interest due to excellent [12][13][14][15][16][17]. In this work, Tm 3+ -doped SrBi 2 Ta 2 O 9 blue-emitting phosphor for W-LEDs has been synthesized at 1200 °C in an ambient atmosphere by solidstate reaction.…”

Synthesis and photoluminescence properties of Ba2Y3(SiO4)3F:Tm3+ blue-emitting fluorosilicate phosphors

“…Tm 3+ is widely used as an efficient blue light emitting center [13]. CaHfO3:Tm 3+ , Li3Gd3Te2O12:Tm 3+ , and CaBi4Ti4O15:Tm 3+ ,Yb 3+ , etc., many alternative Tm 3+doped phosphors have been reported [14][15][16]. In this work, Tm 3+ -doped Ba2Y3(SiO4)3F blue-emitting phosphor for W-LEDs has been synthesized by solidstate reaction.…”