Color tunable emission through energy transfer from Yb3+ co-doped SrSnO3: Ho3+ perovskite nano-phosphor
First time color tunable lighting observed from Ho3+ and Yb3+ co-doped SrSnO3 perovskite. Down-conversion and up-conversion (UC) photoluminescence emission spectra were recorded to understand the whole mechanism of energy migration between Ho3+ and Yb3+ ions. The intensity of green and red emission varies with Yb3+ doping which causes multicolour emissions from nano-phosphor. The intensity of UC red emission (654 nm) obtained from 1 at.% Ho3+ and 3 at.% Yb3+ co-doped nano-phosphor is nine times higher than from 1 at.% Ho3+ doped SrSnO3 nano-phosphor. Enhanced brightness of 654 nm in UC process belongs in biological transparency window so that it might be a promising phosphor in the bio-medical field. Moreover, for the other Yb3+ co-doped nano-phosphor, Commission Internationale de l’Éclairage chromaticity co-ordinates were found near the white region and their CCT values lie in the range 4900–5100 K indicating cool white. Decay time was measured for 545 nm emission of Ho3+ ion found in 7.652 and 8.734 µs at 355 nm excitation. The variation in lifetime was observed in ascending order with increasing Yb3+ concentration which supports PL emission spectra observation that with increasing Yb3+ concentration, rate of transition has changed. These studies reveal that Ho3+ and Yb3+ co-doped phosphor is useful for fabrication of white LEDs.
KeywordsSrSnO3 Nano-phosphor Mechanism Color tuning CCT CIE co-ordinate
Authors are thankful to Sophisticated Instrument Centre of the University for providing various characterization facilities (XRD, SEM, HR-TEM, UV–visible spectrometer). We are thankful to Dr. Vasant Sathe, UGC-CSR-Indore for providing Micro-Raman Spectra. We are also thankful to Dr. Kaushal Kumar for providing Up-conversion PL facility. One of the authors (Neha) acknowledges the Central Research Fellowship provided by University Grants Commission (UGC), Govt. of India. Jai Singh would like to acknowledge UGC-India and DST for providing project under UGC Start-up Grant FT30 [HYPHEN] 56/2014 (BSR)3(A)a and DST Fast track Grant no. SR/FTP/PS [HYPHEN] 144/2012.
- Deng Y, Yi S, Huang J, Xian J, Zhao W (2014) White light emission and energy transfer in Dy3+/Eu3+ co-doped BaLa2WO7 phosphors. Mater Res Bull 57:85–90. https://doi.org/10.1016/j.materresbull.2014.05.035 CrossRefGoogle Scholar
- Deshmukh P, Satapathy S, Ahlawat A, Sahoo K, Gupta PK (2016) Effect of charge transfer band on luminescence properties of Yb doped Y2O3 nano particles for blue-far yellow emission. (arXiv preprint arXiv:1601.01781) Google Scholar
- Kumar AA, Kumar A, Quamara JK, Dillip GR, Joo SW, Kumar J (2015) Fe(III) induced structural, optical, and dielectric behavior of cetyltrimethyl ammonium bromide stabilized strontium stannate nanoparticles synthesized by a facile wet chemistry route. RSC Adv 5(22):17202–17209. https://doi.org/10.1039/C4RA16775A CrossRefGoogle Scholar
- Kumari A, Rai VK (2015) White light emission and effect of annealing on the Ho3+–Yb3+ codoped BaCa2Al8O15 phosphor. Mater Res Bull 72:168–175. https://doi.org/10.1016/j.materresbull.2015.07.020 CrossRefGoogle Scholar
- Kumari A, Soni AK, Dey R, Rai VK (2016) White light emission and optical heating in 3+, Tm3+, Yb3+ codoped La2O3 phosphor. J Display Technol 12(1): 99–105. https://www.osapublishing.org/jdt/abstract.cfm?uri=jdt-12-1-99
- Singh P, Shahi PK, Singh SK, Singh AK, Singh MK, Prakash R, Rai SB (2017) Lanthanide doped ultrafine hybrid nanostructures: multicolour luminescence, upconversion based energy transfer and luminescent solar collector applications. Nanoscale 9(2):696–705. https://doi.org/10.1039/C6NR07250J CrossRefGoogle Scholar