Large micro-sized K2TiF6:Mn4+ red phosphors synthesised by a simple reduction reaction for high colour-rendering white light-emitting diodes. Issue 121 (23rd November 2015)

• Record Type: Journal Article
• Authors: Han, Tao; Lang, Tianchun; Wang, Jun; Tu, Mingjing; Peng, Lingling
• Is Part Of: RSC advances. Volume 5:Issue 121(2015)
• Page Start: 100054
• Page End: 100059
• Publication Date: 2015-11-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra16709d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Large micro-sized K2 TiF6 :Mn 4+ red phosphors synthesised by a simple reduction reaction for high colour-rendering white light-emitting diodes. Abstract : A simple chemical method for synthesising large micro-sized K2 TiF6 :Mn 4+ phosphors (50–100 μm) is presented, based on a direct reduction reaction with K2 TiF6 particles immersed in KMnO4 /HF solution. The Mn 4+ concentration in K2 TiF6 primarily increases as the initial KMnO4 concentration is increased, subject to the diffusion of Mn 4+ ions. However, the relative emission intensity of our synthesised K2 TiF6 :Mn 4+ is first enhanced and then declines with increasing KMnO4 concentration, with an optimum KMnO4 concentration of 0.016 g ml −1, which most likely depends on the concentration quenching effect. The synthesised K2 TiF6 :Mn 4+ (0.35–4.4 at%) phosphors show good thermal stability and can be adopted to fabricate high CRI ( R a > 85) white LEDs for indoor lighting.