Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 26, Pages 8070-8078Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc02504a
Keywords
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Funding
- National Natural Science Foundation of China [51772185, 11104298, 11847058, U1832159]
- National Research Foundation of Korea (NRF) - Ministry of Education [2016R1D1A1B03933488, 2016R1A6A1A03012877]
- Korea government (MSIT) [2019R1A2C1002844]
- National Research Foundation of Korea [2016R1D1A1B03933488] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A series of novel red emitting Mn2+-activated SrZnSO phosphors were successfully synthesized by solid-state reaction at high temperature. The photoluminescence (PL) and mechanoluminescence (ML) properties of these Mn2+-activated SrZnSO phosphors with different Mn2+ concentrations were investigated. With increasing the concentration of Mn2+ from x = 0 to 0.04, the unit cell volume increased from 153.82 to 154.19 angstrom(3) while the optical band gap decreased from 3.74 to 3.43 eV. The site occupation of Mn2+ in the host lattice was demonstrated by Rietveld refinement, the electron paramagnetic resonance (EPR) spectrum, and the spectroscopic properties. A broad band emission peak at 603 nm of SrZn1-xMnxSO (0.001 <= x <= 0.04) with an excitation wavelength of 318 nm was attributed to electronic transitions of Mn2+ from the T-4(1)((4)G) level to the (6)A(1)(S-6) level. The lifetime of SrZn1-xMnxSO (0.001 <= x <= 0.04) decreased monotonously from 2.97 to 0.82 ms with increasing Mn2+ concentration. In particular, intense emission of red light from SrZn1-xMnxSO (0.001 <= x <= 0.04) under compressive load could be observed even with the naked eye, indicating that SrZn1-xMnxSO could be used for stress sensors or stress imaging. There was a linear correlation between the ML intensity and external load in SrZn1-xMnxSO, and the ML intensity could be recovered under UV light irradiation. Considering its advantages of non-destruction, reproducibility, and high ML intensity, SrZn1-xMnxSO might be useful for non-destructive detection of stress.
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