Luminescence Properties of Narrow‐band Red Phosphor CaTiF6·2H2O∶Mn4+ for Warm White Light-emitting Diodes with High Color Rendering Index

CHEN Konglan; ZHANG Xueliang; SONG Enhai; ZHOU Yayun; YUAN Jian; FAN Ting; DENG Tingting

doi:10.37188/CJL.20220310

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Luminescence Properties of Narrow‐band Red Phosphor CaTiF₆·2H₂O∶Mn⁴⁺ for Warm White Light-emitting Diodes with High Color Rendering Index

Synthesis and Properties of Materials | 更新时间：2023-03-13

- Luminescence Properties of Narrow‐band Red Phosphor CaTiF₆·2H₂O∶Mn⁴⁺ for Warm White Light-emitting Diodes with High Color Rendering Index
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 2, Pages: 259-270(2023)
- 作者机构：
  
  1.佛山科学技术学院物理与光电工程学院，粤港澳智能微纳光电技术联合实验室，广东佛山　528225
  2.华南理工大学发光材料与器件国家重点实验室，广东省光纤激光材料与应用技术重点实验室，广东广州　510640
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(51902053);Natural Science Foundation of Guangdong province(2019A1515011988);Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology(2021KTSCX119);Project of Department of Education of Guangdong Province(2020B1212030010);Open Fund of the Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques（South China University of Technology, 2021‐07）
- DOI：10.37188/CJL.20220310
  CLC： O482.31;TN383
- Published：05 February 2023，
  
  Received：27 August 2022，
  
  Revised：15 September 2022，
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陈孔岚,张学亮,宋恩海等.CaTiF₆·2H₂O∶Mn⁴⁺窄带红色荧光粉的发光性能及其高显指暖白光LED应用[J].发光学报,2023,44(02):259-270.

CHEN Konglan,ZHANG Xueliang,SONG Enhai,et al.Luminescence Properties of Narrow‐band Red Phosphor CaTiF₆·2H₂O∶Mn⁴⁺ for Warm White Light-emitting Diodes with High Color Rendering Index[J].Chinese Journal of Luminescence,2023,44(02):259-270.
陈孔岚,张学亮,宋恩海等.CaTiF₆·2H₂O∶Mn⁴⁺窄带红色荧光粉的发光性能及其高显指暖白光LED应用[J].发光学报,2023,44(02):259-270. DOI： 10.37188/CJL.20220310.

CHEN Konglan,ZHANG Xueliang,SONG Enhai,et al.Luminescence Properties of Narrow‐band Red Phosphor CaTiF₆·2H₂O∶Mn⁴⁺ for Warm White Light-emitting Diodes with High Color Rendering Index[J].Chinese Journal of Luminescence,2023,44(02):259-270. DOI： 10.37188/CJL.20220310.

摘要

报道了一种新型的Mn

掺杂水合六氟钛酸钙CaTiF

·2H

O∶Mn

红色荧光粉，详细研究了基质的结构转变和荧光粉的发光性能及高显色指数（显指）暖白光LED应用。CaTiF

·2H

O∶Mn

在130~200 ℃间脱水转化为CaTiF

∶Mn

，荧光光谱发生改变，重新吸附水分子可恢复到CaTiF

·2H

O∶Mn

，发光性能不可逆。重要的是，该荧光粉在较长波626 nm和635 nm处分别发射锐线极强的零声子线（ZPL）和ν

振动峰，色坐标为（0.701， 0.299），更接近人眼敏感的红光边界650 nm（色坐标

~0.72，

~0.28），有助于提高暖白光LED的显色指数、拓宽背光源的色域。晶体结构和晶体场强度计算指出，Mn

在CaTiF

·2H

O∶Mn

中占据低对称性的格位，所受到的晶体场强度较弱，Mn—F键的共价性较强。另外，通过表面疏水化显著提升了荧光粉耐湿性能，共掺小离子半径的Si

增强了荧光粉发光热稳定性。以CaTiF

·2H

O∶Mn

作为红光成分，获得了高显色指数（

=90，

=68）的暖白光LED，在高品质的暖白光照明中具有潜在的应用。

Abstract

Herein， a new Mn

-doped hydrate calcium hexafluorotitanic CaTiF

·2H

O∶Mn

red phosphor is reported. Physical properties of host， luminescence properties and warm white LED application of this phosphor are studied carefully. CaTiF

·2H

O∶Mn

removes H

O to be CaTiF

∶Mn

with changed emission spectrum. CaTiF

∶Mn

could adsorb H

O and recover to CaTiF

·2H

O∶Mn

except emission intensity. Importantly， it emits extremely strong zero phonon line（ZPL） and ν

vibration peaking at longer wavelength of 626 nm and 635 nm in sequence. This unique emission gives color coordinates of （0.701， 0.299）， more closing to the red-light boundary of human eyes sensibility（650 nm， chromaticity coordinate

~0.72，

~0.28）， which could enhance the color rendering index（

） of WLED and widen the color gamut of backlight display. The combination of crystal structure and crystal field strength calculation demonstrates that Mn

ion locates at a highly unsymmetric lattice and experiences weak crystal field strength with strongly covalent Mn—F bond in CaTiF

·2H

O∶Mn

. Moreover， coating with hydrophobic layer enhances the moisture resistant of CaTiF

·2H

O∶Mn

. Codoping small ionic radius Si

improves its thermal stability. Using CaTiF

·2H

O∶Mn

as red-light component， a warm white LED with high

~90 and

~ 68 was achieved， showing potential in high color quality warm white lighting applications.

关键词

Mn4+掺杂氟化物CaTiF6·2H2O∶Mn4+极强零声子线高显色指数暖白光LED

Keywords

Mn4+-doped fluoridesCaTiF6·2H2O∶Mn4+strong zero-phonon linehigh color rendering indexwarm WLED

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