Effects of doped-Li+ and -Eu3+ ions content on structure and luminescent properties of LixSr1−2x(MoO4):Eu3+x red-emitting phosphors for white LEDs

Upconversion photoluminescence properties of SrY2(MoO4)4:Er3+/Yb3+ phosphors synthesized by a cyclic microwave-modified sol–gel method

“…The Er 3+ ion activator is the luminescence center of the UC particles, while the sensitizer enhances the UC luminescence efficiency [7][8][9] Recently, rare earth activated MR 2 (MoO 4 ) 4 (M = Ba, Sr, Ca; R = La, Gd, Y) has attracted great attention because of the its spectroscopic characteristics and excellent upconversion photoluminescence properties. Several processes have been developed to prepare these rare-earth-doped double molybdates, including solid-state reactions [9][10][11][12][13][14], co-precipitation [15,16], the sol-gel method [4][5][6][7], the hydrothermal method [17,18], the Pechini method [19,20], organic gel-thermal decomposition [21], and the microwave-assisted hydrothermal method [22]. For practical application of UC photoluminescence in products such as lasers, three-dimensional displays, light-emitting devices, and biological detectors, features such as the homogeneous UC particle size distribution and morphology need to be well defined.…”

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

“…3) of NaLa(MoO 4 ) 2 : 0.35Eu 3+ by monitoring the emission at 617 nm, which is attributed to the 5 D 0 -7 F 2 transition of Eu 3+ ions, contains a strong broad band centered at $280 nm and several sharp peaks between 350 and 500 nm. The broad band corresponds to the charge-transfer bang of Mo-O and Eu-O [23][24][25]. The several weak sharp peaks at 364 nm, 385 nm, 396 nm, 418 nm and 466 nm belong to the 7 F 0 -5 D 4 , 7 F 0 -5 L 7 , 7 F 0 -5 L 6 , 7 F 0 -5 D 3 and 7 F 0 -5 D 2 transitions within the 4f 6 configuration of Eu 3+ , respectively.…”

Preparation of PbLa2(MoO4)4:Er3+/Yb3+ particles via microwave sol–gel route and upconversion photoluminescence properties

“…The Er 3 þ ion activator is the luminescence center of the UC particles, while the sensitizer enhances the UC luminescence efficiency [5,6,[8][9][10]. To prepare the double molybdates, several processes have been developed via specific preparation processes, including solid-state reactions [11][12][13][14][15], co-precipitation [16,17], the solgel method [4][5][6], the hydrothermal method [18,19], the Pechini method [20,21], organic gel-thermal decomposition [22], the microwave-assisted hydrothermal method [23] and the microwave sol-gel method [7,9]. For practical application of UC photoluminescence in products such as lasers, threedimensional displays, light-emitting devices, and biological detectors, features such as the homogeneous UC particle size distribution and morphology need to be well defined.…”