Preparation and Enhancement of Luminescent Intensity of New Rare Earth Molybdate NaLa(MoO4)2:Eu3+ Phosphors

Abstract

Recently, white light emitting diodes (LEDs) have been applied widely in many fields, such as auto lamp, LCD screen, the landscape lighting and other emerging areas 1-3. They have attracted much attention due to their small size, high luminous reliability, long lifetime, low energy consumption and environment-friendly characteristics 4. The most efficient method to obtain the white light is phosphor-converted. Nevertheless, the traditional red-emitting phosphor used for LED shows a rather low red emission under near-UV light excitation 5. Therefore, it is indispensable to seek novel red phosphors that can be effectively excited by near-UV light. Double molybdates AB(MoO4)2 (A

Highly modified spontaneous emission in NaY(MoO4)2:Yb3+/Er3+ inverse opal photonic crystals

“…Double molybdate crystals with the general formula ARE(MoO 4 ) 2 (A ¼ Li + , Na + , K + , Cs + ; RE ¼ trivalent RE ions) have been regarded as promising materials, because double molybdates structure framework is composed of tetrahedral (MoO 4 ) 2À , the alkaline ions and rare-earth ions are distributed over the cation sites, the different cations with different radii in the host compound would arouse some change in the sublattice structure around the luminescent center ions and then result in different photoluminescent properties, which show high physical and chemical stability, strong water persistence. 32,33 RE-doped ARE(MoO 4 ) 2 materials have been widely studied as attractive laser host materials due to their excellent chemical durability in air atmosphere, large admittance, and the large absorption and emission cross-sections of rare earth ions in their lattices. 34 Moreover, the RE ions doped double molybdate phosphors have high brightness levels, long lifetimes, and the preparation method is easy and low-lost.…”

NaLa(MoO4)2: RE3+ (RE3+=Eu3+, Sm3+, Er3+/Yb3+) microspheres: the synthesis and optical properties

“…[1][2][3][4][5][6][7][8][9]. Especially, RE-doped ARE 2 (MoO 4 ) 2 (A = Li + , Na + , K + , Rb + , Cs + ; RE = trivalent rare earth ions) have been regarded as promising materials, because double molybdates structure framework is composed of tetrahedral (MoO 4 ) 2À , the alkaline ions and rare-earth ions are distributed over the cation sites, the different cations with different radii in the host compound would arouse some change in the sub-lattice structure around the luminescent center ions and then result in different photoluminescent properties [10,11], which show high physical and chemical stability, strong water persistence. It implies that the RE-doped ARE 2 (MoO 4 ) 2 materials can be widely used in catalysts, high-performance phosphors, up-conversion materials, negative thermal expansion materials and so forth [12][13][14][15][16][17][18].…”