Intense Upconverted White Light Emission from Tm3+ - Er3+ - Yb3+ Doped Zinc Tungsten Tellurite Glasses

Yıl 2017, Cilt: 21 Sayı: 3, 786 - 790, 15.08.2017

Gokhan Bilir

https://doi.org/10.19113/sdufbed.28398

Cited By: 3

Öz

The different amount of rare earth ions doped zinc tungsten tellurite glasses with the compositions (70-x-y-z)TeO₂ – 20ZnO – 10WO₃ – xEr₂O₃ – yTm₂O₃ – zYb₂O₃ (x = 0.3, 0.5; y = 0.3, 0.5; z = 3) have been synthesized using melt quenching technique. Blue, green, red and infrared luminescence via energy transfer and frequency upconversion mechanisms in Tm³⁺/Er³⁺/Yb³⁺ triply-doped zinc tungsten tellurite glasses were investigated under single 975 nm diode laser excitation. Intense blue (Tm³⁺: ¹D₂→³F₄, ¹G₄→³H₆; 477 nm), green (²H_11/2, ⁴S_3/2→⁴I_15/2 ; 525 nm and 549 nm), red (Er³⁺: ⁴F_9/2→⁴I_15/2, Tm³⁺: ¹G₄→³F₄; 659 nm) and infrared (Tm³⁺: ¹G₄→³H₅, ³H₄→³H₆ ; 807 nm) emissions were observed simultaneously at room temperature. Intense white light emission from all samples was observed with CCT values higher than 6500 K and CRI values lower than 80. The CIE coordinates of the emitted white light were found to shift to yellowish-greenish region with increasing pumping power. The possible energy transfer and upconversion mechanisms are discussed and plausible explanations are made.

Anahtar Kelimeler

Tellurite glasses, White light; Rare earth ions; Upconversion

Kaynakça

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