Effect of host composition and Eu3+ concentration on the photoluminescence of aluminosilicate (Ca, Sr)2Al2SiO7:Eu3+ phosphors. (January 2017)

• Record Type: Journal Article
• Authors: Park, K.; Kim, H.; Hakeem, D.A.
• Is Part Of: Dyes and pigments. Volume 136(2017)
• Page Start: 70
• Page End: 77
• Publication Date: 2017-01
• Subjects: Photoluminescence -- Phosphors -- (Ca, Sr)2Al2SiO7:Eu3+ -- Emission -- Excitation; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.08.022
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Ca2− x Al2 SiO7 : x Eu 3+ (0.03 ≤ x ≤ 0.21) and Sr2− x Al2 SiO7 : x Eu 3+ (0.03 ≤ x ≤ 0.15) phosphors are effectively excited by near-UV light (396 nm). The host composition and Eu 3+ concentration of the two series phosphors substantially affect its emission characteristics. The calcium aluminosilicate Ca1.82 Al2 SiO7 :0.18Eu 3+ is 377% higher in red emission intensity than the Ca1.97 Al2 SiO7 :0.03Eu 3+, whereas the strontium aluminosilicate Sr1.88 Al2 SiO7 :0.12Eu 3+ is 343% higher in red emission intensity than the Sr1.97 Al2 SiO7 :0.03Eu 3+ . In addition, the Eu 3+ concentration of the Sr2− x Al2 SiO7 : x Eu 3+ ( x = 0.12) showing the highest red emission intensity is much lower than that of the Ca2− x Al2 SiO7 : x Eu 3+ ( x = 0.18). In spite of the low Eu 3+ concentration, the red emission intensity and red color purity of Sr1.88 Al2 SiO7 :0.12Eu 3+ are much stronger and higher than those of the Ca1.82 Al2 SiO7 :0.18Eu 3+ . Of the prepared phosphors, Sr1.88 Al2 SiO7 :0.12Eu 3+ is the optimal composition for obtaining strong and pure red light. Strontium aluminosilicate Sr2− x Al2 SiO7 : x Eu 3+ has distinct advantages including strong emission intensity, high color purity, and cost effectiveness. Highlights: (Ca, Sr)2 Al2 SiO7 :Eu 3+ phosphors are effectively excited by near-UV light (396 nm). Sr2− x Al2 SiO7 : x Eu 3+ is a more efficient red phosphor compared to Ca2− x Al2 SiO7 : x Eu 3+ . Sr1.88 Al2 SiO7 :0.12Eu 3+ is optimal composition for obtaining strong and pure red light. Sr1.88 Al2 SiO7 :0.12Eu 3+ is a promising red-emitting phosphor for LED.