Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 20, 2020
Previous Article Next Article

Structural modulation induced intensity enhancement of full color spectra: a case of Ba3ZnTa2−xNbxO9:Eu3+ phosphors

Author affiliations

Abstract

Modulation of structural order–disorder transition and structural oxygen defects can provide fundamental insights in the optimization of luminescence performances of phosphors. In this study, the luminescence of Ba3ZnTa2O9 (BZT) was systematically elucidated, including the emission arising from the charge transfer (Nb5+/Ta5+ → O2−) and anti-site oxygen defect emission due to the B-site disordering (defect type: [2ZnNb3− + 3Vo2+]), as corroborated by the electronic structural calculations and detailed experiments. We present a two-step design for the optimization of luminescence properties of Ba3ZnTa2O9 phosphor. In the first step, the B-site equivalent doping (Ta5+ substituted by Nb5+) was used to modulate the B-site atomic arrangement, which induced the formation of the cubic phase with B-site full disordering. In the second step, the A-site nonequivalent doping (Ba2+ substituted by Eu3+) was used to decrease the oxygen defect concentration. After the two-step optimization, the photoluminescence excitation spectrum of Ba3−yEuyZnNb2O9 (y = 0.1) shows a broad band excitation (300–400 nm), which is a good match with the near-UV LED chip emission. Even more importantly, the emission spectrum covers the entire visible spectral region and exhibits a remarkably enhanced emission intensity (a 40 times enhancement when compared to that of the intrinsic BZT). The fabricated LED device comprising an n-UV chip (λ = 370 nm) and a single-component Ba3−yEuyZnNb2O9 (y = 0.1) phosphor coating emits a warm white light with a low correlated color temperature (CCT = 4813 K) and a good color rendering index (Ra = 82.36).

Graphical abstract: Structural modulation induced intensity enhancement of full color spectra: a case of Ba3ZnTa2−xNbxO9:Eu3+ phosphors

Back to tab navigation

Supplementary files

Article information


Submitted
08 Mar 2020
Accepted
15 Apr 2020
First published
15 Apr 2020

J. Mater. Chem. C, 2020,8, 6715-6723
Article type
Paper

Structural modulation induced intensity enhancement of full color spectra: a case of Ba3ZnTa2−xNbxO9:Eu3+ phosphors

X. Li, L. Zhou, J. Hong, S. He, X. Jing, M. D. Dramićanin, J. Shi and M. Wu, J. Mater. Chem. C, 2020, 8, 6715
DOI: 10.1039/D0TC01201G

Social activity

Search articles by author

Spotlight

Advertisements