Luminescent Properties of (Ba,Sr)MgAl₁₀O₁₇:Mn,Eu Green Phosphor Prepared by Spray Pyrolysis under VUV Excitation

Abstract

BaMgAl 10 O 17 :Mn phosphor particles with a spherical shape and fine size of less than 1 µm were prepared by spray pyrolysis, and their luminescence properties under vacuum ultraviolet (VUV) excitation were investigated by changing the concentration of activators and the composition of host matrix. It was found that by substituting Sr for Ba sites in the conduction layers the excitation efficiency at wavelengths shorter than 160 nm is enhanced. As a result, the photoluminescence intensity of BaMgAl 10 O 17 :Mn phosphor increases under VUV excitation (147 nm) without any shift in the peak position of the emission spectrum. The photoluminescence intensity of (Ba,Sr)MgAl 10 O 17 :Mn phosphor was also additionally improved by codoping Eu 2+ ions as a consequence of the energy transfer from Eu 2+ in the conduction layer to Mn 2+ in the spinel block. Finally, the highest photoluminescence intensity achieved when 40 at. % of Ba was replaced with Sr and 0.1 at. % Eu was codoped was about 20% higher than that of commercial BaMgAl 10 O 17 :Mn phosphor prepared by a conventional solid-state route.

Preparation and Characterization of Zn/Mg Co-doped aluminate phosphor for white LEDs

“…The space group is P63/mmc. SAM has a β -Al2O3 structure, and has excellent performance due to strong chemical bonds in lattice [7,10] . Fig.1.…”

“…The sample obtained by Zn/Mg co-doped SrMgAl 10 O 17 phosphor showed better luminescence intensity, dispersion, and crystallite than SrMgAl 10 O 17 phosphor. The crystal structure model of SrMgAl 10 O 17 has been built, the band gap and crystal density were calculated. The SrMgAl 10 O 17 phosphor shows best luminescence properties when the ratio of Ca/Sr is 1:2 and the ratio of Zn/Mg is 1:3.…”

“…Therefore, it's necessary to develop aluminate phosphor of excellent performance, simple preparation technology for WLEDs. SrMgAl 10 O 17 (SAM) phosphor is considered to be a substitute for BAM phosphor because of its possessing high quenching temperature, good thermal stability and so on [7][8][9][10] . Solution combustion method [11] can make the phosphor under a state of molecular reactions, avoid the incompleteness of the high temperature solid-state method caused by big gap of solid -solid contact.…”

A Nanostructure Phosphor: Effect of Process Parameters on the Photoluminescence Properties for Near-UV WLED Applications

“…However, if the calcination temperature is too high (say 1,200°C), phase purity decreases. The phase purity of phosphors greatly affects the luminous efficiency; i.e., phosphor particles with higher phase purity have higher luminous efficiency [28]. Therefore, it is expected that 1,100°C is a better temperature for calcination.…”

Synthesis and characterization of spherical core–shell particles SiO2@AgEu(MoO4)2

“…Nowadays, spray pyrolysis technique and template method have been applied to prepare spherical phosphor. However, spray pyrolysis technique requires special equipment, and the products usually contain many hollow and broken spherical particles [6]. Template-directed synthesis is simple and economical for preparing high quality spherical phosphor.…”