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Improvement of emission intensity, colour rendering index and thermal stability of Ca9Ce(PO4)7:Eu2+, Mn2+ via doping H3BO3

Abstract

Ca8.78Ce(PO4)7:0.06Eu2+, 0.16Mn2+, xH3BO3 phosphors are synthesized by a high-temperature solid-state reaction method. The XRD patterns of samples indicate that doping of H3BO3 does not change the phase formation. However, doping of H3BO3 can change the emission intensity of Ce3+, Eu2+, Mn2+ and the energy transfer efficiency of Ce3+-Eu2+ and Ce3+-Mn2+. The reason is that doping of H3BO3 changed the luminescent centre and the distance between different luminescent centres in some degrees. When the ligand polyhedron volume decrease, the lifetime and emission intensity of luminescent centre will increase. When distance between Ce3+ and Eu2+/Mn2+ decrease, the energy transfer efficiency between will increase. In Ca8.78Ce(PO4)7:0.06Eu2+, 0.16Mn2+, xH3BO3, the average volume of [(Eu/Mn)1/2/3-O8/9] polyhedron will decrease from 27.511 Å3 to 21.847 Å3 and the average distance between Ce and (Eu/Mn)1/2 will decrease from 3.702 Å to 3.573 Å with increasing doping amount of H3BO3 from 0 to 7. Meanwhile, emission intensity and lifetime of Ce3+ decrease, and that of Eu2+/Mn2+ increase. Besides, the energy transfer efficiency from Ce3+ to Eu2+/Mn2+ and the quantum efficiency are improved. Doping of H3BO3 perfects the ration of red, green and blue colours of the spectrum, which improved the colour rendering index of materials from 80.5 to 90.7. The doping of H3BO3 also improved the thermal stability of material in some degrees. The quenching temperature of Eu2+ is improved from 75 °C to 100 °C.

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Publication details

The article was received on 04 Sep 2018, accepted on 12 Oct 2018 and first published on 13 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE01496E
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Improvement of emission intensity, colour rendering index and thermal stability of Ca9Ce(PO4)7:Eu2+, Mn2+ via doping H3BO3

    C. Wang, Z. Wang, J. Cheng, Z. Li, M. Tian, Z. Yang and P. Li, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01496E

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