Synthesis and optical properties of green emitting garnet phosphors for phosphor-converted light emitting diodes

Katelnikovas, Artūras; Plewa, J.; Dutczak, Danuta; Möller, Stephanie; Enseling, David; Winkler, Holger; Kareiva, Aivaras; Jüstel, Thomas

doi:10.1016/j.optmat.2012.01.034

Cited by 45 publications

(20 citation statements)

References 28 publications

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“…These utilise the 4f 1 M 5d 1 transitions of Ce 3+ to convert blue light into yellow light, with emission peaking around 550 nm [6,7]. Many other phosphors involving Ce 3+ doping into garnet lattices enable conversion of blue light into the green [8,9] and orange [10][11][12] ranges.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Kalaji

Saines

George

et al. 2013

Chemical Physics Letters

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Section: Introductionmentioning

confidence: 99%

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Kalaji

Saines

George

et al. 2013

Chemical Physics Letters

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“…Additionally, the band structure of the undoped host material were treated with Density Functional Theory (DFT) and evaluated with UV-reflectance spectroscopy. [1][2][3][4][5] However, this approach suffers from major shortcomings such as cold white light and a low color rendering index (CRI), which results from the lack of red light. Therefore, red phosphors with outstanding luminescent performance and strong absorption in the near UV to blue spectral range are highly demanded.…”

mentioning

confidence: 99%

Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs

Jansen

Gorobez

Kirm

et al. 2017

ECS J. Solid State Sci. Technol.

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This work concerns a novel red emitting Mn 4+ doped phosphor showing an extraordinarily high thermal quenching temperature. The composition Y 2 Mg 3 Ge 3 O 12 :Mn 4+ ,Li + exhibits efficient red photoluminescence peaking at 658 nm, which can be assigned to the 2 E g → 4 A 2g intraconfigurational transition of Mn 4+ ([Ar]3d 3 configuration) located at the octahedral site in the garnet structure. Photoluminescence properties, such as temperature dependence of the luminescence intensity and luminescence lifetime are presented. Additionally, the band structure of the undoped host material were treated with Density Functional Theory (DFT) and evaluated with UV-reflectance spectroscopy. [1][2][3][4][5] However, this approach suffers from major shortcomings such as cold white light and a low color rendering index (CRI), which results from the lack of red light. Therefore, red phosphors with outstanding luminescent performance and strong absorption in the near UV to blue spectral range are highly demanded. Compared with the established commercial red phosphors, for example, (Ca,Sr)AlSiN 3 :Eu 2+ and (Ca,Sr,Ba) 2 Si 5 N 8 :Eu 2+ , which typically possess a broad emission band, Mn 4+ activated oxide and fluoride phosphors exhibit an emission spectrum consisting of narrow lines in the red region.6-14 Moreover, the preparation of nitride phosphors requires harsh conditions, i.e. high temperature and pressure, which to a tremendous extent, increase the cost and difficulty of preparation. 15,16 Additionally, rare earth elements as raw materials are too expensive for producing respective phosphors at a low cost-price. Recently, Mn 4+ doped fluoride red emitting phosphors have attracted much attention because of the simple and efficient fabrication process, i.e. they can be prepared at room temperature or slightly above (20-80• C) by cation exchange reaction. 17 However, these types of materials have a huge drawback because toxic hydrofluoric acid is needed for their synthesis. Additionally, Mn 4+ doped fluorides are rather sensitive toward high temperature, high humidity, and large excitation densities provided by LEDs. [18][19][20] In general, Mn 4+ doped oxide phosphors were prepared using conventional oxides, nitrates, and perchlorates as starting materials. All these disadvantages could be overcome by using an oxide type host material, if one is able to find a Mn 4+ doped oxide host with a rather narrow emission band peaking at approximately 630 nm. 24-26 Accordingly, research activity and commercial interest is highly focused on Mn 4+ based phosphors presently. These type of materials can emit in the desired red spectral region with a high quantum yield and thus meet the efficiency and color quality demands of the next generation warm white pcLEDs. It is well known, that the Mg 14 Ge 5 O 24 :Mn 4+ phosphor (also known as Mg-fluorogermanate due to the presence of some MgF 2 as a flux) has extraordinary good properties in terms of the thermal quenching of the luminescence (T 1/2 > 700 K).27 Due to this circumstance, the au...

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“…S3 †). 31 The emission intensity of YAG:Ce 3+ particles also increased with increasing sintering temperature. To investigate the variations in porosity, specic surface areas of the particles were measured using nitrogen adsorption isotherms (Fig.…”

Section: Resultsmentioning

confidence: 93%

Two-step spray-drying synthesis of dense and highly luminescent YAG:Ce³⁺ phosphor powders with spherical shape

Cho

Jung

2015

RSC Adv.

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Two-step spray drying using a commercially available spray dryer was carried out to prepare dense and spherical Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) particles with good luminescence characteristics. Hollow YAG:Ce 3+ powder particles with a thin shell were first obtained by the spray drying of an aqueous precursor solution containing citric acid as an organic additive. The powder was then pulverized into nanoparticles measuring tens of nanometers in size by ball milling. The second spray drying using a colloidal solution of the nanometer-sized precursor powder made it possible to successfully produce spherical YAG:Ce 3+ particles with an average size of 2-3 mm. After thermal treatment at a high temperature between 1200 and 1400 C, spherical YAG:Ce 3+ particles with a pure phase and dense structure were obtained. These particles were shown to have good luminescence characteristics suitable for the fabrication of white light-emitting diodes.

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Synthesis and optical properties of green emitting garnet phosphors for phosphor-converted light emitting diodes

Cited by 45 publications

References 28 publications

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs

Two-step spray-drying synthesis of dense and highly luminescent YAG:Ce³⁺ phosphor powders with spherical shape

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Synthesis and optical properties of green emitting garnet phosphors for phosphor-converted light emitting diodes

Cited by 45 publications

References 28 publications

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Photoluminescence of cerium-doped (Ca1−xSrx)3RE2Ge3O12 garnet phosphors for solid state lighting: Relating structure to emission

Narrow Band Deep Red Photoluminescence of Y2Mg3Ge3O12:Mn4+,Li+Inverse Garnet for High Power Phosphor Converted LEDs

Two-step spray-drying synthesis of dense and highly luminescent YAG:Ce3+ phosphor powders with spherical shape

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Product

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Narrow Band Deep Red Photoluminescence of Y₂Mg₃Ge₃O₁₂:Mn⁴⁺,Li⁺Inverse Garnet for High Power Phosphor Converted LEDs

Two-step spray-drying synthesis of dense and highly luminescent YAG:Ce³⁺ phosphor powders with spherical shape