Issue 46, 2021

Samarium and manganese incorporation to improve color rendering of LuAG:Ce3+ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

Abstract

Deficient red and cyan components are critical limitations that hamper the real applications of single-structured phosphor ceramics in laser-driven white lighting sources (white LDs). In this study, Ce3+ and Sm3+ were incorporated into Lu3Al5O12 (LuAG:Ce3+,Sm3+) ceramics for the fabrication of white LDs. Multiple narrow-intensified emissions around 569 nm, 618 nm, and 667 nm originating from the 4G5/26HJ (J = 5/2, 7/2, 9/2) transitions of Sm3+ were identified as an efficient energy transfer (ET) from Ce3+ to Sm3+ ions. Impressively, the ET efficiency of 47.4% from Ce3+ to Sm3+ was achieved by spectral regulation; this was the highest value among those of Ce3+–Sm3+-co-doped garnet phosphor materials, and its mechanism was deduced to be dipole–dipole interactions based on the Inokuti–Hirayama (I–H) model. The integral and red emission intensities of the as-prepared LuAG:0.02Ce3+,0.04Sm3+ ceramics at 425 K were 85.8% and 75.3% of that at 300 K, respectively, implying satisfactory thermal stability of fluorescence. A white LD with a high color rendering index (CRI) of up to 78.5 was obtained with the introduction of Mn2+ into the LuAG:Ce3+,Sm3+ system by employing single-structured Ce0.02Sm0.04Lu2.94Mn0.04Al4.92Si0.04O12 phosphor ceramics under 450 nm laser excitation. This result provides a promising pathway for high color quality and practical solid-state lighting based on garnet phosphor ceramics.

Graphical abstract: Samarium and manganese incorporation to improve color rendering of LuAG:Ce3+ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

Supplementary files

Article information

Article type
Paper
Submitted
13 Sep 2021
Accepted
29 Oct 2021
First published
01 Nov 2021

J. Mater. Chem. C, 2021,9, 16468-16476

Samarium and manganese incorporation to improve color rendering of LuAG:Ce3+ phosphor ceramics for laser-driven lighting: a Color-tunable and energy transfer study

B. Sun, B. Jiang and L. Zhang, J. Mater. Chem. C, 2021, 9, 16468 DOI: 10.1039/D1TC04370F

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