多氟化物NaLiScF₆中具有高能级能量的锰的发光特性

Luminescence properties of Mn with high E level energy in the polyfluoride NaLiScF.

作者信息

Li Hong, Liu Yan, Tang Shu, Luo Lijun, Zhou Qiang, Wang Zhengliang

机构信息

Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials, School of Chemistry & Environment, Yunnan Minzu University, Kunming, 650500, P. R. China.

出版信息

Dalton Trans. 2020 Aug 25;49(33):11613-11617. doi: 10.1039/d0dt02389b.

DOI:10.1039/d0dt02389b

PMID:32779680

Abstract

A new red-emitting phosphor based on polyfluoride Na3Li3Sc2F12 doped with Mn4+ 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 2Eg level of Mn4+ was observed in Na3Li3Sc2F12:Mn4+. The Racah parameters B and C were calculated to be 604 cm-1 and 3840 cm-1, respectively. The as-obtained Na3Li3Sc2F12:Mn4+ (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, Na3Li3Sc2F12:Mn4+ as a new red-emitting phosphor has great potential application in w-LEDs.

摘要

通过室温共沉淀法制备了一种基于掺杂Mn4+的多氟化物Na3Li3Sc2F12的新型红色发光荧光粉。详细讨论了其晶体结构、发光性能及应用。合成的荧光粉在461 nm光激发下发出618 nm的具有强零声子线（ZPL）的红光。在Na3Li3Sc2F12:Mn4+中观察到Mn4+的2Eg能级具有更高的能量。计算得出Racah参数B和C分别为604 cm-1和3840 cm-1。所制备的Na3Li3Sc2F12:Mn4+（4.86 mol%）具有66.8%的高内量子效率（IQE）和较好的抗热猝灭性能。制备了显色指数高达92、色温低至3694 K的白光发光二极管（w-LED）。因此，Na3Li3Sc2F12:Mn4+作为一种新型红色发光荧光粉在w-LED中具有巨大的潜在应用价值。