Photoluminescence Characteristics of a New Thiogallate‐Based Green‐Emitting Phosphor: MgGa2S4:Eu2+. Issue 6 (15th March 2013)

• Record Type: Journal Article
• Authors: Yu, Ruijin; Noh, Hyeon Mi; Moon, Byung Kee; Choi, Byung Chun; Jeong, Jung Hyun; Jang, Kiwan; Yi, Soung Soo; Jang, Jun Kyu; Srivastava, A.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 6(2013)
• Page Start: 1821
• Page End: 1826
• Publication Date: 2013-03-15
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12257
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12257-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A new thiogallate‐based green‐emitting phosphor, MgGa₂S₄:Eu²⁺, was first synthesized via a high‐temperature solid‐state reaction in a CS₂ atmosphere. We then investigated the structures and luminescent properties of the MgGa₂S₄:Eu²⁺ phosphors. The MgGa₂S₄:Eu²⁺ phosphors can be excited efficiently by UV–visible light in the wavelength range from 350 to 520 nm and they emit an intensely green light with emission bands peaking at 538 nm. The optimal concentration for Eu²⁺ in MgGa₂S₄ was found to be about 6 mol%, and the corresponding concentration quenching mechanism was the electric multipole–multipole interaction. The quenching temperature was calculated to be 402 K, and the Huang–Rhys factor was about 4. The energy barrier for thermal quenching was calculated to be 0.28 and 0.27 eV by the two types of the Arrhenius equations. The small variation in the color coordinates of MgGa₂S₄:Eu²⁺ under high temperatures indicates that the as‐synthesized phosphor has good color stability. Due to their broadband absorption in the 350–520 nm wavelength range, these phosphors may be able to fulfill the requirements for application in the development of Ga(In)N‐based white LEDs.</p> </abstract>