Journal article Open Access

The influence of Ce3+ codoping and excitation scheme on spectroscopic properties of NaYF4:Yb3+,Ho3+

Pilch-Wrobel, Aleksandra; Zasada, Joanna; Bednarkiewicz, Artur

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        <dct:identifier rdf:datatype="">0000-0003-1991-4008</dct:identifier>
        <foaf:name>Pilch-Wrobel, Aleksandra; Zasada, Joanna; Bednarkiewicz, Artur</foaf:name>
        <foaf:givenName>Aleksandra; Zasada, Joanna; Bednarkiewicz, Artur</foaf:givenName>
            <foaf:name>Institute of Low Temperature and Structure Research, PAS, Ul. Okolna 2, Wrocław, 50-422, Poland</foaf:name>
    <dct:title>The influence of Ce3+ codoping and excitation scheme on spectroscopic properties of NaYF4:Yb3+,Ho3+</dct:title>
    <dct:issued rdf:datatype="">2020</dct:issued>
    <dcat:keyword>upconversion, multicolour emission, cerium,</dcat:keyword>
    <frapo:isFundedBy rdf:resource="info:eu-repo/grantAgreement/EC/H2020/801305/"/>
        <dct:identifier rdf:datatype="">10.13039/501100000780</dct:identifier>
        <foaf:name>European Commission</foaf:name>
    <dct:issued rdf:datatype="">2020-06-22</dct:issued>
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    <dct:description>&lt;p&gt;The possibility to design and intentionally tune the luminescent properties of phosphors, e.g. their emission colour, quantum yield and kinetic behavior, is&amp;nbsp; of fundamental significance and a&amp;nbsp; challenge for numerous applications. Usually, to obtain multicolour emission, multiple nanomaterials with different co-dopants combinations, sizes or chemical architectures are synthesized and characterized. Of special interest would be those materials, where on-demand and in-situ modi-fications of multicolour emission can be obtained by changing the external stimulus, such as magnetic field, temperature, excitation intensity or pulse width. Here we synthesize and evaluate luminescent NaYF4 nanoparticles doped Yb3+/Ho3+, whose red and green emission colour is modulated by variable concentration of Ce3+admixture, excitation pulse duration and temperature. In the first scenario (Yb3+/Ho3+only doping), such materials exhibit strong and stable green upconversion emission. Upon Ce3+co-doping, the red to green ratio (RGR) changed from 0,43 (for pristine dopants) to 4,23 (for 15%Ce3+co-doped samples). Moreover, the measurement performed with excitation pulse width modulation (PWM) enabled to increase contribution of red emission in-situ. For short excitation pulses, the green emission was observed, while for longer pulses the red emission started to dominate. Finally, the energy transfer in this tri-doped system demonstrated to be sus-ceptible to external temperature as well, with relative thermal sensitivity of 0,8%/K in biological range for 5%Ce3+doped sample. Detailed spectroscopic analysis including temperature dependent emission spectra, rise times and emission kinetics allow us to understand and propose the possible energy transfer mechanisms in this system.&lt;/p&gt;</dct:description>
    <dct:description>{"references": ["[1] J.-W. Shen, J. Lu, J. Tu, X. Ouyang, H. Li, Enhanced 808 nm driven Ce3+ doped red-emitting upconversion nanocrystals by intercalated nanostructures, J. Mater. Chem. C. 4 (2016) 4905\u20134911. doi:10.1039/C6TC01430E. [2] S. Heer, K. K\u00f6mpe, H.U. G\u00fcdel, M. Haase, Highly efficient multicolour upconversion emission in transparent colloids of lanthanide-doped NaYF4 nanocrystals, Adv. Mater. 16 (2004) 2102\u20132105. doi:10.1002/adma.200400772. [3] J. Liao, D. Jin, C. Chen, Y. Li, J. Zhou, Helix Shape Power-Dependent Properties of Single Upconversion Nanoparticles, J. Phys. Chem. Lett. (2020). doi:10.1021/acs.jpclett.9b03838. [4] Z.Y. and T.Z. and Y.X. and W.L. and C.Q. and H.L. and S.Z. and J. Hao, Multicolor tuning towards single red-emission band of upconversion nanoparticles for tunable optical component and optical/x-ray imaging agents via Ce3+ doping, Nanotechnology. 26 (2015) 385702. doi:10.1088/0957-4484/26/38/385702. [5] D. 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    <dct:identifier rdf:datatype="">801305</dct:identifier>
    <dct:title>Nanoparticles-based 2D thermal bioimaging technologies</dct:title>
        <dct:identifier rdf:datatype="">10.13039/501100000780</dct:identifier>
        <foaf:name>European Commission</foaf:name>
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