Luminescent properties of BaO-La2O3-B2O3 glasses with dopant

The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were stud{ed. The emissions spectra of Eu^2 and Eu^3 were observed in BaO-La2O3-B2O3-Eu2O3 glasses.The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu^2 , the sharp emission peaks at 592, 616, 650 and 250 nm correspond to 5^D0→1Fj(j=1--4) emission transition of Eu^3 ,respectively, which indicates that the BaO-La2O3a-B2O3-Eu2O3 glass can convert ultraviolet and green omponents of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent in--tensity of Eu^2 increases with increasing the molar ratio of Tb^3 in BaO-La2O3-B2O3-Eu2O3a-Tb4O3 glasses, whereas the luminescent intensity of Eua^3 decreases. So the luminescent intensity of Eu(Ⅲ,Ⅱ) is influenced by Tb^3 .These phenomena can be explained by electron transfer mechanism; Eu^3 (4f6) Tb^3 (4f^8)→Eu^2 (4f′) Tb^4 (4f′). Taking advantage of the luminescent properties of BaO-La2O3-B2O3-Eu2O3 glasses, light-conversion glass for agriculture can be produced.

Luminescent properties of BaO-La2O3-B2O3 glasses with dopant

The luminescent properties of glasses synthesized in air atmosphere by conventional high temperature process were studied. The emissions spectra of Eu²⁺ and Eu³⁺ were observed in BaO-La₂O₃-B₂O₃-Eu₂O₃ glasses. The results show that the broad emission peaks at 430 nm correspond to 5d→4f emission transition of Eu²⁺, the sharp emission peaks at 592, 616, 650 and 750 nm correspond to ⁵D₀→⁷F _j (j=1–4) emission transition of Eu³⁺, respectively, which indicates that the BaO-La₂O₃-B₂O₃-Eu₂O₃ glass can convert ultraviolet and green components of sunlight into blue and red light so as to increase the intensity of blue and red light, respectively. The luminescent intensity of Eu²⁺ increases with increasing the molar ratio of Tb³⁺ in BaO-La₂O₃-B₂O₃-Eu₂O₃-Tb₄O₇ glasses, whereas the luminescent intensity of Eu³⁺ decreases. So the luminescent intensity of Eu(III, II) is influenced by Tb³⁺. These phenomena can be explained by electron transfer mechanism: Eu³⁺ (4f⁶) + Tb³⁺ (4f⁸) → Eu²⁺ (4f⁷) + Tb⁴⁺ (4f⁷). Taking advantage of the luminescent properties of BaO-La₂O₃-B₂O₃-Eu₂O₃ glasses, light-conversion glass for agriculture can be produced. Foundation item: Project (02JJY2020) supported by the Natural Science Foundation of Hunan Province