Controlled synthesis, bioimaging and toxicity assessments in strong red emitting Mn2+ doped NaYF4:Yb3+/Ho3+ nanophosphors. Issue 59 (2nd June 2016)

• Record Type: Journal Article
• Authors: Reddy, K. L.; Rai, M.; Prabhakar, N.; Arppe, R.; Rai, S. B.; Singh, S. K.; Rosenholm, J. M.; Krishnan, V.
• Is Part Of: RSC advances. Volume 6:Issue 59(2016)
• Page Start: 53698
• Page End: 53704
• Publication Date: 2016-06-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra07106f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Rare earth, Yb 3+ /Ho 3+ doped NaYF4 nanophosphors co-doped with Mn 2+ showed enhanced red emission under NIR irradiation and were successfully used for cancer cell imaging. Abstract : Rare earth, Yb 3+ /Ho 3+ doped NaYF4 nanophosphors showed augmentation of visible green and red light emission by the introduction of Mn 2+ as a co-dopant. Nanophosphors were characterized for their morphology and upconversion (UC) fluorescence, as a function of co-dopant concentration. The effect of Mn 2+ doping has been investigated to explore the UC mechanism of the phosphors. With the introduction of Mn 2+, the intensity of all the emission bands was increased, in particular the red band, which was most significant at 40 mol% doping. A possible mechanism for the enhancement of the red emission has been proposed. The prepared UC nanoparticles were functionalized with polyethylene glycol–polyethylene imine co-polymer to make them water dispersible and successfully applied for cancer cell imaging.