Wavelength-Tunability and Multiband Emission from Single-Site Mn2+ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions

Song E, Wang J, Ye S, Yang XB, Peng M, Zhang Q, Wondraczek L (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Advanced Optical Materials Wiley

Book Volume: 5

Article Number: 1700070

Journal Issue: 13

DOI: 10.1002/adom.201700070

Abstract

In modern phosphor materials, in contrast to single-band emission, simultaneous photoluminescence through two or more emission bands enables broad and tailorable emission color, but requires fine control of activator precipitation on specific crystallographic sites. This presents a major obstacle in the design of tunable emitters, since dedicated control of site occupancy is rarely possible. Here, a new paradigm of tunability is considered, which overcomes this limitation. It is demonstrated in CaO:Mn2+ that single- and dual-band emission can be generated by involving only a single type of crystallographic sites. This enables tailoring of the emission color alone through dopant concentration. The two emission bands exhibit different spectral, dynamic, and thermal characteristics, but very similar excitation spectra. While the variations in thermal quenching provide a tool for tunability, the variations in decay behavior suggest interesting potential for lifetime-multiplexing and coding. Energy transfer is observed between the two emission bands, using time-resolved emission spectra. From the analysis of crystal structure, spectral data, electron paramagnetic resonance analyses, and density functional theory calculations analyses, it is found that the emission bands at ≈600 and 660 nm originate from isolated Mn2+ ions and superexchange reactions in Mn2+ Mn2+ dimers, respectively.

Authors with CRIS profile

Lothar Wondraczek

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN) Friedrich-Schiller-Universität Jena DE Germany (DE)

How to cite

APA:

Song, E., Wang, J., Ye, S., Yang, X.-B., Peng, M., Zhang, Q., & Wondraczek, L. (2017). Wavelength-Tunability and Multiband Emission from Single-Site Mn2+ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions. Advanced Optical Materials, 5(13). https://doi.org/10.1002/adom.201700070

MLA:

Song, Enhai, et al. "Wavelength-Tunability and Multiband Emission from Single-Site Mn2+ Doped CaO Through Antiferromagnetic Coupling and Tailored Superexchange Reactions." Advanced Optical Materials 5.13 (2017).

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