One-step surfactant-free controllable synthesis and tunable up-conversion/down-shifting white light emissions of Sr2YF7 crystals doped with Ln3+ ions. Issue 41 (6th October 2020)

• Record Type: Journal Article
• Authors: Shen, Dingyi; Mao, Yini; Yang, Jun; Cao, Lu; Ning, Juntao; Hu, Shanshan
• Is Part Of: CrystEngComm. Volume 22:Issue 41(2020)
• Page Start: 6911
• Page End: 6919
• Publication Date: 2020-10-06
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce00280a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : In this work, uniform and monodisperse Sr2 YF7 spheres were successfully synthesized via a facile one-step hydrothermal route without employing any surfactant. Abstract : In this work, uniform and monodisperse Sr2 YF7 spheres were successfully synthesized via a facile one-step hydrothermal route without employing any surfactant. Particularly, a well-defined morphology of Sr2 YF7 crystals ranging from spherical to octahedral shape was first achieved by adjusting the pH values. In addition, the spherical products doped with 6% Ln 3+ (Ln = La, Ce, Pr, Sm, Gd, and Dy) show different sizes ranging from 300 to 600 nm. The Sr2 YF7 crystals also exhibit excellent multicolor DS/UC luminescence properties after doping with different Ln 3+ ions. Energy transfer from Tb 3+ to Eu 3+ was observed in Sr2 YF7 crystals; the Sr2 YF7 :Dy 3+ crystals showed nearly white light emission under UV excitation; Sr2 YF7 :Yb 3+ /Er 3+ /Tm 3+ crystals could produce pure white light with a CIE color coordinate of (0.3123, 0.3005) by controlling the doping concentrations of Er 3+ and Tm 3+ ions under 980 nm excitation. The as-prepared phosphors may potentially serve as light, color displays and markers in biological imaging.