Synthesis and luminescence properties of NaLa(MoO 4 ) 2− x AG x :Eu 3+ (AG = SO 4 2 − , BO 3 3 − ) red phosphors for white light emitting diodes

Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO4)3:Er3+/Yb3+: structural and spectroscopic properties

“…Er 3+ and Yb 3+ ion co-doping can remarkably enhance the UC efficiency for the shift from the infrared to visible light due to the efficiency of the energy transfer from Yb 3+ to Er 3+ . [15][16][17] For the preparation of the double molybdate NaLn(MoO 4 ) 2 , several processes have been developed via specific preparation processes, including solid-state reactions, 4,8,[18][19][20][21] the sol-gel method, 22,23 Czochralski growth, [24][25][26][27] the hydrothermal method, [28][29][30][31][32] the microwave assisted hydrothermal method 33 and pulsed laser deposition. 34 Nevertheless, it is necessary to create new triple molybdate compounds for the observation of the UC photoluminescence in the materials and to search for features such as a well-defined morphology and stable UC luminescent properties.…”

Phase formations and tunable red phosphors of LiYb1−Eu (MoO4)2 (x = 0.01–1)

“…The CT band extends with the full-width at half-maximum of about 6970 cm -1 and shows no significant change in spectral shape for x = 0.01-1.0 as shown in Fig. 2 [27,28].…”

“…Of various hosts for Eu 3+ doping, molybdates are attractive hosts owing to energy transfer from Mo-O complex to RE ions [12]. Molybdate phosphors have been intensively investigated for solid-state lighting [13,14], such as, MR 2 (MoO 4 ) 4 :Eu 3+ (M = Ba, Sr, Ca; R = La 3+ , Gd 3+ ) [15], CaMoO 4 :Eu 3+ [16], Gd 2 MoO 6 :Eu 3+ [17], La 2 Mo 2 O 9 :Eu 3+ [18], Li 3 trivalent rare earth ions) with scheelite-like (CaMoO 4 ) structure, are considered to be efficient luminescent hosts showing high efficiency, excellent thermal, hydrolytic stability, mechanical stability and easy to dope a large number of rare earth ions [20].…”

Incommensurately Modulated Structures and Luminescence Properties of the AgxSm(2–x)/3WO4 (x = 0.286, 0.2) Scheelites as Thermographic Phosphors

“…White light emitting diodes (WLEDs) are promising solid-state lighting sources that have already replaced for a large part conventional incandescent and fluorescent lamps. They are reliable, have a long lifetime, consume only minor amounts of energy, and are environmentally friendly. , Among the materials with high potential for WLED applications (and also for solid state lasers) are the molybdate and tungstate phosphors with a scheelite-type (CaWO 4 ) structure, doped by rare earth elements. − They have broad, intense absorption bands in the near-UV region originating from a charge transfer from oxygen to Mo/W. For example, for NaEu­(WO 4 ) 2 the emission peak (∼615 nm) intensity and the integral emission intensity (proportional to the quantum efficiency) are, respectively, about 8.5 and 5.0 times those (∼626 nm) of the commercial Y 2 O 2 S:Eu 3+ phosphor .…”