@article{article_382219, title={Intense Upconverted White Light Emission from Tm3+ - Er3+ - Yb3+ Doped Zinc Tungsten Tellurite Glasses}, journal={Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi}, volume={21}, pages={786–790}, year={2017}, DOI={10.19113/sdufbed.28398}, author={Bilir, Gokhan}, keywords={Tellurite glasses,White light; Rare earth ions; Upconversion}, abstract={The different amount of rare earth ions doped zinc tungsten tellurite glasses with the compositions (70-x-y-z)TeO 2 – 20ZnO – 10WO 3 – xEr 2 O 3 – yTm 2 O 3 – zYb 2 O 3 (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 Tm 3+ /Er 3+ /Yb 3+ triply-doped zinc tungsten tellurite glasses were investigated under single 975 nm diode laser excitation. Intense blue (Tm 3+ : 1 D 2 → 3 F 4 , 1 G 4 → 3 H 6 ; 477 nm), green ( 2 H 11/2 , 4 S 3/2 → 4 I 15/2 ; 525 nm and 549 nm), red (Er 3+ : 4 F 9/2 → 4 I 15/2 , Tm 3+ : 1 G 4 → 3 F 4 ; 659 nm) and infrared (Tm 3+ : 1 G 4 → 3 H 5 , 3 H 4 → 3 H 6 ; 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.}, number={3}, publisher={Süleyman Demirel University}