Recent progress in advanced optical materials based on gadolinium aluminate garnet (Gd₃Al₅O₁₂)

Abstract

This review article summarizes the recent achievements in stabilization of the metastable lattice of gadolinium aluminate garnet (Gd3Al5O12, GAG) and the related developments of advanced optical materials, including down-conversion phosphors, up-conversion phosphors, transparent ceramics, and single crystals. Whenever possible, the materials are compared with their better known YAG and LuAG counterparts to demonstrate the merits of the GAG host. It is shown that novel emission features and significantly improved luminescence can be attained for a number of phosphor systems with the more covalent GAG lattice and the efficient energy transfer from Gd3+ to the activator. Ce3+ doped GAG-based single crystals and transparent ceramics are also shown to simultaneously possess the advantages of high theoretical density, fast scintillation decay, and high light yields, and hold great potential as scintillators for a wide range of applications. The unresolved issues are also pointed out.

Structure evolution and photoluminescence of Lu3(Al,Mg)2(Al,Si)3O12:Ce3+ phosphors: new yellow-color converters for blue LED-driven solid state lighting

“…8). The energy position of the Ce 3+ 4f 6 5d 1 excited state and the 4f 7 →4f 6 5d 1 transition in inorganic host will be modified by the case-sensitive covalence and polarizability of the Ce-ligand interaction, 43 as the Ce 5d electron is exposed to its surrounding ligands. As the Mg-Si pair is incorporated, the maximum emission gradually red-shifts from 542 nm (x=0) to 571 nm (x=2.0).…”

Sulfate Exchange of the Nitrate-Type Layered Hydroxide Nanosheets of Ln2(OH)5NO3·nH2O for Better Dispersed and Multi-color Luminescent Ln2O3 Nanophosphors (Ln = Y0.98RE0.02, RE = Pr, Sm, Eu, Tb, Dy, Ho, Er, and Tm)

“…The origins of the other PLE/PL bands in each part of Fig. 9 are well documented and can be found in the literature [19, 51–53]. It is seen from the Commission Internationale de l’Eclairage (CIE) chromaticity diagram that the phosphors synthesized in this work span a wide range of emission colors, from blue (Tm 3+ ) to deep red (Pr 3+ ) via green (Tb 3+ , Ho 3+ , and Er 3+ ), yellow (Dy 3+ ), orange (Sm 3+ ), and orange red (Eu 3+ ).

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“…The origins of these main bands [19, 51–53] are summarized in Table 1, together with the chromaticity coordinates of emission and the fluorescence lifetime. The origins of the other PLE/PL bands in each part of Fig.…”

Luminescence properties of Tb3+ doped Gd2(WO4)3 phosphor prepared by hydrothermal method

“…The original chemicals which were used in the work mainly contain the Gd 2 After the above process was completed, a certain proportion of Na 2 WO 4 ꞏ2H 2 O white particles were dissolved in 50 ml water, then dissolve an appropriate amount of nitrate solution in 20ml of water, put in a collector type constant temperature magnetic stirrer, stirring for about 5 min; When the two kinds of raw materials are completely dissolved and stirred in deionized water, the obtained nitrate solution is uniformly dripped into the sodium tungstate solution, and the titration ends at the end of 30 min, add NaOH solution to the mixture and adjust the pH until pH=7, The resulting reaction solution is then moved to a stainless steel autoclave with a capacity of 100 ml; The reaction kettle is placed in the oven, and the oven is set at a temperature of 120℃ and the reaction time is 24 h. After the reaction was completed, the reaction kettle was cooled to room temperature to remove the hydrothermal products; The obtained hydrothermal products are cleaned repeatedly through deionized water and cleaned once by anhydrous ethanol, dispersing the product into ethanol (80℃, dried 6 h) and drying the precursor after drying; Finally, the precursor was calcined in high temperature (900℃ 2 h) high temperature air and the target phosphor was obtained.…”

“…During the past decades, the rare earth (RE 3+ ) doped the glass, ceramics and phosphors has been widely applied in developing the new optical devices, such as displays, biosensors, solid-state lasers and fiber amplifiers [1][2][3] . The characteristics of the rare earth elements 4f electron layer configuration make the corresponding compounds having various fluorescence characteristics.…”