Thermally stable La2LiSbO6:Mn4+, Mg2+ far-red emitting phosphors with over 90% internal quantum efficiency for plant growth LEDs. Issue 56 (12th September 2018)

• Record Type: Journal Article
• Authors: Sun, Liangling; Devakumar, Balaji; Liang, Jia; Li, Bin; Wang, Shaoying; Sun, Qi; Guo, Heng; Huang, Xiaoyong
• Is Part Of: RSC advances. Volume 8:Issue 56(2018)
• Page Start: 31835
• Page End: 31842
• Publication Date: 2018-09-12
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra06435k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Double perovskite La2 LiSbO6 :Mn 4+, Mg 2+ far-red emitting phosphors with internal quantum efficiency as high as 92% and good thermal stability were developed for plant growth LEDs. Abstract : In this paper, we reported on the high-efficiency and thermally-stable La2 LiSbO6 :Mn 4+, Mg 2+ (LLS:Mn 4+, Mg 2+ ) far-red emitting phosphors. Under 338 nm excitation, the composition-optimized LLS:0.3%Mn 4+, 1.6%Mg 2+ phosphors which were made up of [SbO6 ], [LiO6 ], and [LaO8 ] polyhedrons, showed intense far-red emissions peaking at 712 nm ( 2 Eg → 4 A2g transition) with internal quantum efficiency as high as 92%. The LLS:0.3%Mn 4+, 1.6%Mg 2+ phosphors also exhibited high thermal stability, and the emission intensity at 423 K only reduced by 42% compared with its initial value at 303 K. The far-red light-emitting device has also been made by using the LLS:0.3%Mn 4+, 1.6%Mg 2+ phosphors and a 365 nm emitting InGaN chip, which can emit far-red light that is visible to the naked eye. Importantly, the emission spectrum of the LLS:0.3%Mn 4+, 1.6%Mg 2+ phosphors can match well with the absorption spectrum of phytochrome PFR, indicating the potential of these phosphors to be used in plant growth light-emitting diodes.