Luminescence properties of Mn4+ with high 2Eg level energy in the polyfluoride Na3Li3Sc2F12. Issue 33 (11th August 2020)

• Record Type: Journal Article
• Authors: Li, Hong; Liu, Yan; Tang, Shu; Luo, Lijun; Zhou, Qiang; Wang, Zhengliang
• Is Part Of: Dalton transactions. Volume 49:Issue 33(2020)
• Page Start: 11613
• Page End: 11617
• Publication Date: 2020-08-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt02389b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Red-emitting phosphor Na3 Li3 Sc2 F12 :Mn 4+ with the high 2 Eg level energy shows intensive red emission accompanied with the high external quantum efficiency and thermal-quenching resistance for warm white LEDs. Abstract : A new red-emitting phosphor based on polyfluoride Na3 Li3 Sc2 F12 doped with Mn 4+ was prepared via a co-precipitation method at room temperature. Its crystal structure, luminescence properties and applications are discussed in detail. The as-synthesized phosphor emits red light with intense zero-phonon line (ZPL) at 618 nm under the excitation of 461 nm light. A higher energy of the 2 Eg level of Mn 4+ was observed in Na3 Li3 Sc2 F12 :Mn 4+ . The Racah parameters B and C were calculated to be 604 cm −1 and 3840 cm −1, respectively. The as-obtained Na3 Li3 Sc2 F12 :Mn 4+ (4.86 mol%) shows a high internal quantum efficiency (IQE) of 66.8% and better resistance to thermal quenching. A white light-emitting diode (w-LED) with a high color rendering index of 92 and a low color temperature of 3694 K was fabricated. Hence, Na3 Li3 Sc2 F12 :Mn 4+ as a new red-emitting phosphor has great potential application in w-LEDs.