Issue 12, 2019

Full visible light emission in Eu2+,Mn2+-doped Ca9LiY0.667(PO4)7 phosphors based on multiple crystal lattice substitution and energy transfer for warm white LEDs with high colour-rendering

Abstract

Designing two-step tuning based on substitution of multiple cation lattices and energy transfer successfully achieved versatile colour output for single-phase phosphor-converted white LEDs in this work. Herein, we chose whitlockite-type Ca9LiY0.667(PO4)7 compound as a host which provides multiple cation sites for Eu2+ occupation. Spectral results indicate that the Ca9LiY0.667(PO4)7:Eu2+ phosphor emits a cold white emission due to its multiple emission bands at about 420, 480, and 530 nm, which correspond to emissions from the M(3), M(1)/M(2) and M(5) cation sites as ascertained by the Rietveld refinement method. In order to enhance the red emission of CLYPO:Eu2+ phosphors, they were codoped with Mn2+. Warm white emission in a single-phase host based on energy transfer was successfully obtained in the CLYPO:Eu2+,Mn2+ phosphors. The excitation band of the CLYPO:Eu2+,Mn2+ phosphors in the 360 to 450 nm range perfectly coincides with that of commercial LED chips, implying that these phosphors are desirable for white LED applications. White LEDs with a higher color rendering index (Ra = 90.2) and a lower correlated color temperature (CCT = 3614 K) were achieved by using a single-phase CLYPO:0.03Eu2+,0.10Mn2+ phosphor and a 395 nm InGaN-LED chip.

Graphical abstract: Full visible light emission in Eu2+,Mn2+-doped Ca9LiY0.667(PO4)7 phosphors based on multiple crystal lattice substitution and energy transfer for warm white LEDs with high colour-rendering

Supplementary files

Article information

Article type
Paper
Submitted
08 Січ 2019
Accepted
19 Лют 2019
First published
21 Лют 2019

J. Mater. Chem. C, 2019,7, 3644-3655

Full visible light emission in Eu2+,Mn2+-doped Ca9LiY0.667(PO4)7 phosphors based on multiple crystal lattice substitution and energy transfer for warm white LEDs with high colour-rendering

M. Cui, J. Wang, M. Shang, J. Li, Q. Wei, P. Dang, H. S. Jang and J. Lin, J. Mater. Chem. C, 2019, 7, 3644 DOI: 10.1039/C9TC00109C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements