Abstract
Rare earth doped luminescent materials can be used in fluorescent lamps, display devices, biology and many other fields. Especially, phosphors with controllable morphology and multicolor tunable luminescence have many virtues. Thus, the synthesis of suitable phosphors is very important. Among all the synthesis methods, hydrothermal method stands out. Europium activated terbium tungstate (Tb2 (WO4)3: Eu3+) phosphors with controllable morphology have been successfully synthesized by hydrothermal method, followed by a subsequent calcination process. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) are employed to characterize the samples. Controlling the reaction parameters, a variety of morphology have been obtained. Thanks to the efficient energy transfer from WO42- to Tb3+ to Eu3+, Tb2 (WO4)3: Eu3+ phosphors demonstrate outstanding luminescent properties with tunable colors under ultraviolet (UV) excitation, which makes it possible that the emission colors of Tb2 (WO4)3: Eu3+ phosphors can be altered from green, yellow, orange to red with the doped Eu3+ content increasing. The facile preparation route and multicolor tunable luminescence make the materials promising candidate phosphors applied in future color displays and light-emitting devices.
Highlights
[4] UC materials are mainly applied in biological field and DC materials are mainly applied in plasma panel displays (PDPs), field emission displays (FEDs), cathode ray tubes (CRTs) and light-emitting diodes (LEDs). [3] LEDs are recognized as
Koseva et al reported NaAlSiO4 glass-ceramics co-doped by Tb3+ and Eu3+ ions, [9] from which we can see that Tb3+ and Eu3+ ions are all co-doped in a third-party hosts, and that means multicolor emissions can only be implemented by co-doping at least two rare earth ions, complicating the synthesis route and energy transfer process
Tb2(WO4)[3]: Eu3+ phosphors have been successfully synthesized by hydrothermal method followed by subsequent calcination treatment
Summary
Rare earth (RE) elements, namely yttrium, scandium and the 14 elements of the lanthanide (Ln) series, are often referred to as the “industrial secret ingredients” due to their unique physical and chemical properties associated with the activities of their f-shell electrons. [1] Currently, RE elements can be involved in practically all everyday activities of modern society because of their enormously wide range of applications, which comprise materials for catalysis, magnets, phosphors, ceramics, polishing, glasses, batteries, among others. [2] Light and rare earths have a long lived relationship that dates from the discoveries of these elements in the nineteenth century. [2] A long lifetime, high mono-chromaticity, a large stokes shift, sharp fluorescence and high resistance to photobleaching make RE-based luminescent materials superior to traditional luminescent materials. [3] Generally speaking, RE-doped luminescent materials can be divided into up-conversion (UC) luminescent materials, and down-conversion (DC) luminescent materials. Rare-earth ions have been occupying an irreplaceable position in modern lighting and display fields due to the abundant emission colors based on their 4f→4f or 5d→4f transitions. I. Koseva et al reported NaAlSiO4 glass-ceramics co-doped by Tb3+ and Eu3+ ions, [9] from which we can see that Tb3+ and Eu3+ ions are all co-doped in a third-party hosts, and that means multicolor emissions can only be implemented by co-doping at least two rare earth ions, complicating the synthesis route and energy transfer process. Among all the preparation methods, the hydrothermal method is one of the most efficient way to synthesize materials with uniform and controllable morphology. We take advantage of the efficiency of hydrothermal method and successfully synthesize Tb2(WO4)[3]: Eu3+ phosphors with controllable morphology and multicolor luminescent properties. Multicolor emissions (from green, yellow, orange to red) are achieved in a single host material (Tb2(WO4)3) by adjusting the doped Eu3+ content
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
