Synthesis and photoluminescence properties of novel far-red-emitting BaLaMgNbO6:Mn4+ phosphors for plant growth LEDs. Issue 50 (10th August 2018)

• Record Type: Journal Article
• Authors: Sun, Qi; Wang, Shaoying; Devakumar, Balaji; Li, Bin; Sun, Liangling; Liang, Jia; Huang, Xiaoyong
• Is Part Of: RSC advances. Volume 8:Issue 50(2018)
• Page Start: 28538
• Page End: 28545
• Publication Date: 2018-08-10
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra06048g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Mn 4+ -activated BaLaMgNbO6 far-red emitting double-perovskite phosphors with internal quantum efficiency up to 52% were developed for potential application in plant growth LEDs. Abstract : A series of far-red-emitting BaLaMgNbO6 :Mn 4+ (BLMN:Mn 4+ ) phosphors were successfully synthesized by a high-temperature solid-state reaction method. Crystal structure and luminescence properties of the obtained samples were systematically investigated. The emission spectra exhibited a strong narrow far-red emission band peaking at 700 nm with a full width at half-maximum (FWHM) of ∼36 nm under 360 nm excitation. The optimal Mn 4+ concentration was about 0.4 mol%. The internal quantum efficiency and CIE chromaticity coordinates of the BLMN:0.4% Mn 4+ phosphor were 52% and (0.7222, 0.2777), respectively. In addition, the luminescence mechanism has been analyzed using a Tanabe–Sugano energy level diagram. Finally, by using a 365 nm near-ultraviolet InGaN chip combined with BLMN:0.4% Mn 4+ phosphors, a far-red LED device was fabricated.