Nanoparticles of a doped oxide phosphor prepared by direct-spray pyrolysis

Abstract

A gas-phase synthesis route based on spray pyrolysis with a residence/heating time of less than 0.1 s was designed to directly prepare Eu-doped Y2O3 phosphor nanoparticles. The average size of the phosphor particles decreased from the submicron size to around 10 nm when the concentration of the starting solution was increased. By increasing the operating temperature, from 1500 to 1700 °C, the submicron-particles were converted into a nano-particle phosphor, and their photoluminescence intensities at 611 nm (254-nm excitation) were greatly improved. This synthesis procedure has considerable potential for preparing a variety of doped luminescent nanoparticles without the need for post-treatment processing.

Applications of Ultrasound to the Synthesis of Nanostructured Materials

“…[156,[195][196][197][198][199] In addition to the versatility of this novel route, the molten salts serve as an effective liquid flux to improve mass transport. [195] Due to the greatly enhanced mass transfer rates, the materials produced via the salt-assisted aerosol decomposition method are often much more crystalline than the USP products obtained by the conventional USP method, which can improve their physical properties substantially.…”

Well-defined crystallites autoclaved from the nitrate/NH4OH reaction system as the precursor for (Y,Eu)2O3 red phosphor: Crystallization mechanism, phase and morphology control, and luminescent property

“…A handful of techniques can be found in the literature for Y 2 O 3 :Eu 3 þ synthesis, including solid-state reaction [2], combustion [3], sol-gel [4,5], precipitation [6][7][8][9][10], high temperature pyrolysis [11][12][13], thermal plasma processing [14,15], chemical vapor deposition [16], and hydrothermal reaction [17][18][19][20][21][22][23][24]. The products made with these techniques have their peculiar features and may thus meet the different requirements for applications in fluorescent lamps, white LEDs, plasma display panels (PDP), flat-panel displays (FPD), field emission displays (FED), cathode-ray tubes (CRT), and so on [1].…”

Novel Processing for Softly Agglomerated Luminescent Y2O3: Eu3+ Nanoparticles Using Polymeric Precursors

“…1),2) Convention ally, a few micrometer sized phosphor particles are pre pared via a breakdown route, such as solidstate synthesis. There have been a number attempts to synthesis submicron order or sub100 nm of Y 2 O 3 :Eu 3{ phosphors particles by a variety of methods, including gas phase, 3) spray pyrolysis, 4), 5) and wetchemical routes. 6)10) However, the challenge is to de velop a fast method, where the produced ne (submicron and sub100 nm) phosphor particles with highly crystallinity, and emitting a high luminescence intensity.…”