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Comprehensive investigations of near infrared downshift and upconversion luminescence mechanisms in Yb3+ single-doped and Er3+, Yb3+ co-doped SiO2 inverse opal

Abstract

Comprehensive investigations of near infrared (NIR) downshift and visible upconversion luminescence (UCL) mechanisms were carried out in Yb3+ single-doped and Er3+, Yb3+ co-doped SiO2 inverse opal under the excitation of 256, 378, 520 and 980 nm. The 976 nm NIR emissions from Yb3+-O2- charge transfer state and 500 nm UCL due to the cooperative emission of two Yb3+ ions were observed in SiO2: Yb3+ inverse opal upon the 256 and 980 nm excitations, respectively. The suppression of cooperative UCL of two Yb3+ ions was obtained due to the photon trap caused by photonic band gap. For the SiO2: Er3+, Yb3+ inverse opals, the 976 nm of Yb3+ and 1534 nm NIR emission of Er3+ were observed upon the 256, 378 and 520 nm excitation, respectively. Upon the 378 and 520 nm excitations, the 976 nm NIR emission of Yb3+ is not from (2H11/2/4S3/2)+2Yb3+(2F7/2)→Er3+(4I15/2)+2Yb3+(2F5/2) traditional quantum cutting. The 976 nm NIR emission of Yb3+ may be attributed to the Er3+(2H11∕2)+Yb3+(2F7/2)→Yb3+(2F5/2)+Er3+(4I11/2) cross-relaxation energy transfer process upon the 520 nm excitation. The 976 nm NIR emission of Yb3+ may be from the cross-relaxation energy transfer of Er3+(4G11∕2)+Yb3+(2F7/2) →Yb3+(2F5/2)+Er3+(4F9/2) and Er3+(4F9/2)+Yb3+(2F7/2) →Yb3+(2F5/2)+Er3+(4I13/2) upon the 378 nm excitation.

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Publication details

The article was received on 27 Sep 2017, accepted on 04 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06622H
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Comprehensive investigations of near infrared downshift and upconversion luminescence mechanisms in Yb3+ single-doped and Er3+, Yb3+ co-doped SiO2 inverse opal

    Z. Yang, Y. Jianzhi, Q. Jianbei and Z. Song, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06622H

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