Tm3+ - Er3+ - Yb3+ Katkılı Çinko Tungsten Tellürit Camlarından Üst Enerji Dönüşümü Yoluyla Şiddetli Beyaz Işık Emisyonu

(70-x-y-z)TeO2 – 20ZnO – 10WO3 – xEr2O3 – yTm2O3 – zYb2O3 (x = 0.3, 0.5; y = 0.3, 0.5; z = 3) bileşimine sahip farklı miktarlarda nadir toprak iyonları katkılandırılmış çinko tungsten tellurit camları ergitme döküm tekniği kullanılarak sentezlenmiştir. Tm3+/Er3+/Yb3+ üçlü nadir toprak iyonu katkılı çinko tungsten tellürit camlarında üst enerji dönüşümü ve enerji transfer süreçleri yoluyla elde edilen mavi, yeşil, kırmızı ve kızılötesi lüminesansları 975 nm diyot lazer uyarımı altında araştırılmıştır. Buna göre, şiddetli mavi (Tm3+: 1D2→3F4, 1G4→3H6; 477 nm), yeşil (2H11/2, 4S3/2→4I15/2 ; 525 nm and 549 nm), kırmızı (Er3+: 4F9/2→4I15/2, Tm3+: 1G4→3F4; 659 nm) ve kızılötesi (Tm3+: 1G4→3H5, 3H4→3H6 ; 807 nm) emisyonları eş zamanlı olarak oda sıcaklığında gözlenmiştir. Bütün numunelerden CCT değerleri 6500 K’den büyük ve CRI değerleri 80’den küçük şiddetli beyaz ışık emisyonu gözlenmiştir. Yayılan beyaz ışığın CIE koordinatlarının, artan pompalama gücü ile sarımsı-yeşilimsi bölgeye kaydığı bulunmuştur. Olası enerji transfer süreçleri ve üst enerji dönüşüm mekanizmaları tartışılmış ve gerekli açıklamalar yapılmıştır.

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

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 (2H11/2, 4S3/2→4I15/2 ; 525 nm and 549 nm), red (Er3+: 4F9/2→4I15/2, 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.

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