Issue 42, 2023

Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

Abstract

Inorganic phosphors with tunable broadband emission have important applications in solid-state lighting and security anti-counterfeiting. Therefore, developing materials with simultaneous requirements of spectral tunability and ultra-broadband emission is significant for artificial lighting applications. In this work, we develop a series of solid-solution phosphors with tunable broadband emission, NayCa9−x−y/2Al6O18:xBi3+ (0.005 ≤ x ≤ 0.04, 0.625 ≤ y ≤ 2). The structure transformation and site occupancy engineering of Bi3+ in NayCa9−x−y/2Al6O18 phosphors are demonstrated. Due to the structural transformation and multi-site occupation of Bi3+, an ultra-broad full-visible-spectral emission can be realized in single phased Na2Ca7.98Al6O18:0.02Bi3+, which simultaneously exhibits visual spectral tunability through site-selective excitation. A simplified packaging technology is proposed to fabricate a white light emitting diode (WLED) based on only Na2Ca7.98Al6O18:0.02Bi3+ phosphor and an ultraviolet LED chip, with a CCT of 5577 K and high color rendering index (Ra = 84.2). Moreover, the optical anti-counterfeiting application is demonstrated by using the screen-printing technique. Our findings not only suggest a novel strategy to develop tunable ultra-broadband full-visible-spectral luminescence phosphors but also pave a new way to explore more efficient ultra-broadband phosphors for multi-functional photonic applications.

Graphical abstract: Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

Supplementary files

Article information

Article type
Paper
Submitted
20 Jun 2023
Accepted
23 Sep 2023
First published
29 Sep 2023

J. Mater. Chem. C, 2023,11, 14621-14630

Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

Q. Bian, G. Zhu, Z. Li, S. Li, W. Xu, Y. Cong, M. He, S. Xin and B. Dong, J. Mater. Chem. C, 2023, 11, 14621 DOI: 10.1039/D3TC02171H

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