Enhancement in the water resistance and thermal stability of Na3HTiF8:Mn4+ by co-doping with organic amine cations. Issue 47 (22nd November 2022)

• Record Type: Journal Article
• Authors: Deng, Daishu; Lei, Jun; Li, Yuelan; Wang, Lin; Wang, Tianman; Wen, Huizhong; Liao, Sen; Huang, Yingheng
• Is Part Of: Dalton transactions. Volume 51:Issue 47(2022)
• Page Start: 18308
• Page End: 18316
• Publication Date: 2022-11-22
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt03438g
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Organic amine ions change the structural rigidity and improve the thermal stability and water resistance of phosphors. Abstract : Mn 4+ -doped fluoride red light phosphors are widely utilized in various fields, and their luminous performance is influenced by their stability in high humidity and temperature environments. By incorporating TEOAH + (TEOAH + = (HOCH2 CH2 )3 NH + ) into the Na2 TiF6 matrix, Na3 HTiF8 :Mn 4+, TEOAH + with improved thermal stability and water resistance was synthesized. Enhancement in the luminescence thermal stability is supported by its strong negative thermal quenching (NTQ) effect, which is attributed to the phonon-induced mechanism wherein the probability of radiative transitions increases much faster than the probability of non-radiative transitions. Additionally, the integrated emission intensity of the optimal sample Na3 HTiF8 :Mn 4+, 0.15TEOAH + was maintained at 70.1% after being immersed in water for 360 min, which may be attributed to the addition of TEOAH + cations in the structure, thus increasing its structural rigidity. The prototype light-emitting diode (LED) has a narrow emission band, 88.6% color gamut, and 83.1 lm W −1 light efficiency, according to the National Television Standards Committee (NTSC). The qualities of the phosphor make it an ideal candidate for back-lighting devices.