Improved thermal conductivity and tailored phonon dynamics in hexagonal prism-like ZnO:Er3+ upconverting phosphor
Er ^3+ ions doped ZnO phosphors have been synthesized by using the chemical co-precipitation method. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), UV–Visible, and Ra...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/adeb4a |
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| Summary: | Er ^3+ ions doped ZnO phosphors have been synthesized by using the chemical co-precipitation method. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), UV–Visible, and Raman spectroscopy characterizations were performed for the developed phosphor. Upconversion emission spectra under 980 nm laser diode excitation show detectable Er ^3+ ion transitions in the visible colour region. The introduction of the Er ^3+ in the ZnO matrix exhibits two strong new Raman modes at 637 cm ^−1 due to 2(E _2H -E _2L ) and 830 cm ^−1 due to A _1 (TO) + E _2L , originating via tailored phonon dynamics. An unusual linewidth narrowing and blue shift of the characteristic Raman band of the wurtzite structure corresponding to the E _2H Raman mode of the ZnO: Er ^3+ phosphor has been observed. An enhanced phonon lifetime of about 1.56 $\times {10}^{-12}$ s was calculated for the E _2H Raman mode. Moreover, the thermal conductivity measurement shows a noticeable increment in the ZnO: Er ^3+ (0.072 W·m ^−1 ·K ^−1 ) as compared to the ZnO (0.067 W·m ^−1 ·K ^−1 ) phosphor due to the reduced electron–phonon coupling. The synthesized ZnO: Er ^3+ phosphor may be used for upconverting and thermoelectric material development. |
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| ISSN: | 2053-1591 |