Simultaneous improvement in emission intensity and spectral purity of red photon upconversion in Gd 2 O 3 :Yb 3+ /Er 3+
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Simultaneous improvement in emission intensity and spectral purity of red photon upconversion in Gd2O3:Yb3+/Er3+ phosphors under 1550 nm excitation Tao Pang1 Received: 17 June 2020 / Accepted: 3 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Upconversion luminescent nano-materials with both excitation and emission peaks in the “optical window” is of significant importance for application in deeper bio-imaging, due to the weak effects of light absorption, light scattering, and autofluorescence. This paper reports an E r3+ self-sensitized red up-converting nanophosphors with improved emission intensity and spectral purity. The influence of Yb3+ concentration on upconversion luminescence properties is investigated comprehensively. Compared with the sample without Y b3+ doping, the luminescence intensity in the sample with 10% Y b3+ is increased by 12.9 times. Moreover, the dominant wavelength at 1550 nm excitation is about 60 nm larger than that excited at 980 nm. It has been demonstrated that Y b3+ co-doping can not only improve the photon absorption at 1550 nm and the probability of red emission, but also suppress other light emissions and phonon emission through the selective population of red-emitting level. Keywords Red upconversion emission · 1550 nm excitation · Spectral purity · Yb3+ co-doping
1 Introduction Recently, lanthanide-doped up-conversion nanoparticles have attracted much attention of researchers due to their potential applications in solar cells, temperature sensing, three-dimensional display, anti-counterfeiting, biomedicine and so on [1–5]. However, most researches use a 980 nm laser diode as excitation source and the emission wavelength is in the visible band. Because of strong absorption of short wavelength (
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