The mechanism of this phenomenon is attributed to the f-f intersaction for either Tb3+/Sm3. The ABL:Tb, Sm glasses can produce color emission from green to red by properly tuning the relative ratio between Tb3+ and Sm3+. | VNU Journal of Science: Mathematics – Physics, Vol. 35, No. 1 (2019) 21-28 Original article Luminescence Properties of Tb, SmCo-doped in Alkali Aluminoborate Glasses Tran Ngoc*, Phan Thi Hoai Thương, Hoang Sy Tai Faculty of Natural Sciences, Quang Binh Unversity, 312 Ly Thuong Kiet, Quang Binh, Vietnam Received 11December 2018 Revised 12March 2019; Accepted 17March 2019 Abstract: Spectroscopic properties of Tb3+ and Sm3+ ions co-doped in alkali aluminoborate glasses (70-x-y) (ABL:Tb, Sm) fabricated by melting method have been studied. The emission intensity of Tb3+ or Sm3+ in ABL:Tb or ABL:Sm glasses is influenced by the Tb3+ or Sm3+doping concerning with the mol% and mol% optimum concentrations, respectively. The concentration quenching effect of Tb3+ or Sm3+ in ABL:Tb, Sm glasses is observed. The mechanism of this phenomenon is attributed to the f-f intersaction for either Tb3+/Sm3. The ABL:Tb, Sm glasses can produce color emission from green to red by properly tuning the relative ratio between Tb3+ and Sm3+. The emission intensity of Tb3+/Sm3+ in ABL:Tb, Sm glasses can be enhanced by the energy transfer from Tb 3+/Tb3+ and Sm3+/Sm3+. The results indicate that ABL:Tb, Sm may be a promising double emission for white light emitting diodes. Keywords:Sm3+and Tb3+ ions; alkali aluminoborate glass, the concentration quenching mechanism. 1. Introduction White light-emitting diodes (LEDs) offer many advantages such as long service lifetime, thermal resistance, and high efficiency [1-3]. Therefore, white LEDs are expected to be a new light source in the illumination field. Besides that, due to the unique structural and physicochemical properties, alkali aluminoborate glasses doped with RE ions with the ingredients focus on the advantages: mechanical stability, chemical, thermal, low melting point, solubility of rare earth ions good and high transparency[4-5]. The presence of structurally different borate units in alkali metal
