Direct fabrication of metavanadate phosphor films on organic substrates for white-light-emitting devices

Abstract

White-light-emitting materials have attracted considerable attention because of their applications, such as large-surface emitting devices. Inorganic phosphor films are expected to be applied to these devices because of good chemical stability; however, a substantial reduction of fabrication temperature is required for future industrial uses such as lighting materials fabricated onto flexible organic substrates. Here we show the optical properties of white-light-emitting metavanadate phosphors, AVO3 (A: K, Rb and Cs), and we report a new direct fabrication process for RbVO3 films onto flexible polyethylene terephthalate (PET) substrates by means of a vacuum ultraviolet irradiation using an excimer lamp. In addition, the (Ca,Sr,Pr)TiO3/a-Al2O3/RbVO3/PET heterostructure prepared by an excimer-laser-assisted metal-organic deposition process has demonstrated the possibility of colour modification for RbVO3 films on PET. Our findings suggest new possibilities for further development of large-surface emitting lighting devices.

Thermal and luminescent properties of M2Zn(VO3)4 (M = Rb, Cs)

“…Rb 2 Zn(VO 3 ) 4 was synthesized in two steps. First, rubidium metavanadate was prepared through melting at 620°C (followed by cooling at a rate of 1°C/min in a platinum crucible) and zinc metavanadate was pre pared by solid state reaction (610°C, 60 h).…”

“…Vanadium compounds have long been used as effi cient phosphors, laser gain media, and thermolumi nescent dosimeters [1][2][3][4][5]. Nevertheless, the study of new individual compounds continues to receive a great deal of attention [2].…”

“…Nevertheless, the study of new individual compounds continues to receive a great deal of attention [2]. The poorly studied zinc containing double vanadates with the general formula M 2 Zn(VO 3 ) 4 , where M is an alkali metal, constitute a new subclass of earlier synthesized vanadates [6][7][8].…”

“…The purpose of this work is to study the synthesis conditions, structure, and thermal and spectroscopic properties of the Rb 2 Zn(VO 3 ) 4 and Cs 2 Zn(VO 3 ) 4 tet rametavanadates, which contain rubidium and cesium spectrally active ions and the zinc cation, whose spec tral activity in mixed metavanadates has not been studied previously. New vanadates have been tested for efficient red X ray luminescence for medical applica tions.…”

“…

Abstract-We have developed processes for the synthesis of the Rb 2 Zn(VO 3 ) 4 and Cs 2 Zn(VO 3 ) 4 tetrameta vanadates. Rb 2 Zn(VO 3 ) 4 has been prepared by solid state reaction (350°C) between presynthesized RbVO 3 and ZnV 2 O 6 powders, and Cs 2 Zn(VO 3 ) 4 has been prepared by the Pechini method (sol-gel process).

…”