Thermally stable and highly efficient red-emitting Eu3+-doped Cs3GdGe3O9 phosphors for WLEDs: non-concentration quenching and negative thermal expansion

Peipei Dang; Guogang Li; Xiaohan Yun; Qianqian Zhang; Dongjie Liu; Hongzhou Lian; Mengmeng Shang; Jun Lin

doi:10.1038/s41377-021-00469-x

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Thermally stable and highly efficient red-emitting Eu³⁺-doped Cs₃GdGe₃O₉ phosphors for WLEDs: non-concentration quenching and negative thermal expansion

Articles

- Thermally stable and highly efficient red-emitting Eu³⁺-doped Cs₃GdGe₃O₉ phosphors for WLEDs: non-concentration quenching and negative thermal expansion
- Light: Science & Applications Vol. 10, Issue 2, Pages: 243-255(2021)
- Affiliations：
  
  1.State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China
  2.University of Science and Technology of China, 230026 Hefei, China
  3.Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 430074 Wuhan, China
  4.School of Material Science and Engineering, Shandong University, 266071 Jinan, China
  5.School of Applied Physics and Materials, Wuyi University, 529020 Guangdong, China
- Author bio：
  
  Guogang Li (ggli@cug.edu.cn)
  Jun Lin (jlin@ciac.ac.cn)
- Funds：
- DOI：10.1038/s41377-021-00469-x
  CLC：
- Published：2021，
  
  Published Online：01 February 2021，
  
  Received：13 August 2020，
  
  Revised：14 December 2020，
  
  Accepted：11 January 2021
- Accepted：
Scan QR Code
Dang, P. P. et al. Thermally stable and highly efficient red-emitting Eu³⁺-doped Cs₃GdGe₃O₉ phosphors for WLEDs: non-concentration quenching and negative thermal expansion. Light: Science & Applications, 10, 243-255 (2021).
DOI：

Dang, P. P. et al. Thermally stable and highly efficient red-emitting Eu³⁺-doped Cs₃GdGe₃O₉ phosphors for WLEDs: non-concentration quenching and negative thermal expansion. Light: Science & Applications, 10, 243-255 (2021). DOI： 10.1038/s41377-021-00469-x.

摘要

Abstract

Red phosphor materials play a key role in improving the lighting and backlit display quality of phosphor-converted white light-emitting diodes (pc-WLEDs). However

the development of a red phosphor with simultaneous high efficiency

excellent thermal stability and high colour purity is still a challenge. In this work

unique non-concentration quenching in solid-solution Cs

1 −

(CGGO:

) (

= 0.1–1.0) phosphors is successfully developed to achieve a highly efficient red-emitting Cs

EuGe

(CEGO) phosphor. Under the optimal 464 nm blue light excitation

CEGO shows a strong red emission at 611 nm with a high colour purity of 95.07% and a high internal quantum efficiency of 94%. Impressively

this red-emitting CEGO phosphor exhibits a better thermal stability at higher temperatures (175–250 ℃

90%) than typical red K

SiF

: Mn

and Y

: Eu

phosphors

and has a remarkable volumetric negative thermal expansion (coefficient of thermal expansion

= −5.06 × 10

−5

/℃

25–250 ℃). By employing this red CEGO phosphor

a fabricated pc-WLED emits warm white light with colour coordinates (0.364

0.383)

a high colour rendering index (CRI = 89.7)

and a low colour coordinate temperature (CCT = 4508 K). These results indicate that this highly efficient red-emitting phosphor has great potential as a red component for pc-WLEDs

opening a new perspective for developing new phosphor materials.

关键词

Keywords

references

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