Silica coated, water dispersible and photoluminescent Y (V,P)O4:Eu3+,Bi3+nanophosphors

Darbandi, Masih; Hoheisel, W.; Nann, Thomas

doi:10.1088/0957-4484/17/16/029

Cited by 55 publications

(35 citation statements)

References 35 publications

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“…Recently, YAG:Ce [38], LaPO 4 :Eu [75]; CePO 4 :Tb [75]; YVO 4 :Eu [14,74]; and (Y,P)VO 4 :Eu,Bi [19] nanoparticles <20 nm in size have been produced.…”

Section: Nanophosphorsmentioning

confidence: 99%

Research challenges to ultra‐efficient inorganic solid‐state lighting

Phillips¹,

Coltrin

Crawford

et al. 2007

Laser & Photonics Reviews

378

268

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Solid-state lighting is a rapidly evolving, emerging technology whose efficiency of conversion of electricity to visible white light is likely to approach 50% within the next several years. This efficiency is significantly higher than that of traditional lighting technologies, giving solid-state lighting the potential to enable significant reduction in the rate of world energy consumption. Further, there is no fundamental physical reason why efficiencies well beyond 50% could not be achieved, which could enable even more significant reduction in world energy usage. In this article, we discuss in some detail: (a) the several approaches to inorganic solid-state lighting that could conceivably achieve "ultra-high," 70% or greater, efficiency, and (b) the significant research questions and challenges that would need to be addressed if one or more of these approaches were to be realized.

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“…Recently, YAG:Ce [38], LaPO 4 :Eu [75]; CePO 4 :Tb [75]; YVO 4 :Eu [14,74]; and (Y,P)VO 4 :Eu,Bi [19] nanoparticles <20 nm in size have been produced.…”

Section: Nanophosphorsmentioning

confidence: 99%

Research challenges to ultra‐efficient inorganic solid‐state lighting

Phillips¹,

Coltrin

Crawford

et al. 2007

Laser & Photonics Reviews

378

268

View full text Add to dashboard Cite

show abstract

“…D 2d site is highly asymmetric leading to the high electric dipole transition probability. In free VO 4 3− , the charge transfer from oxygen ligands to the central vanadium shows maximum absorption at 268 nm [27]. From the viewpoint of molecular orbital theory, it corresponds to transitions from the 1 A 2 ( 1 T 1 ) ground state to 1 A 1 ( 1 E) and 1 E ( 1 T 2 ) excited states of VO 4 3− ion.…”

Section: Photoluminescence Studymentioning

confidence: 99%

“…Many works on improvement of luminescent properties of core-shell nanoparticles such as SnO 2 :Eu-TiO 2 , SnO 2 :Eu-SiO 2 , LaF 3 :RE-LaF 3 and YVO 4 :Eu-SiO 2 were reported [15,27,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Energy transfer process and optimum emission studies in luminescence of core–shell nanoparticles: YVO4:Eu–YVO4 and surface state analysis

Ningthoujam

Singh

Sudarsan

et al. 2009

Journal of Alloys and Compounds

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“…To alleviate the impact of surface defects in nanocrystalline powders, core/shell structured nanoparticles have been used to stabilize the surface of the nanoparticles. 54,55 It was found that the luminescence intensity, chemical stability and thermal stability were improved by the presence of inert shells. [56][57][58] It has been found that EPD from suspension of nano-sized particles of (Ba 0.97 Eu 0.03 ) 2 SiO 4 in an IPA bath yielded a non-uniform and porous film, 28 as shown in Figure 15, for both photographs (under excitation of 365 nm light) and SEM micrographs.…”

Section: Ecs Journal Of Solid State Science and Technology 5 (1) R31mentioning

confidence: 99%

Review—Electrophoretic Deposition of Phosphors for Solid-State Lighting

Talbot

McKittrick

2015

ECS J. Solid State Sci. Technol.

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Electrophoretic deposition (EPD) is a facile method to produce phosphor particulate films for solid-state lighting applications. EPD has produced films in the conformal (deposited directly on the LED) or remote configurations (deposited on a substrate above the LED). Films of different blended phosphor compositions have been deposited to produce white emission, either by excitation with blue-emitting or near UV-emitting LEDs. Layered films of sequentially deposited phosphors have also been shown to produce white light. The key results from both experiments and theory are described and summarized, which show the utility of EPD as a phosphor particle coating method. Commercial white light from GaInN light emitting diodes (LEDs) arises from the combination of the blue light from the LED (450 nm), which is used to activate a broadband yellow-emitting phosphor (Y 3 Al 5 O 12 :Ce 3+ , YAG:Ce), and a small amount of red-emitting phosphor (e.g. Ca-αSiAlON:Eu 2+1 ) for color correction. The placement and arrangement of phosphors are crucial to the extraction efficiency of white-emitting LEDs. Phosphor arrangements in white-emitting LEDs are illustrated in Figure 1. Figure 1a shows the phosphor particles embedded in an encapsulant surrounding the LED and housed in a reflector cup (phosphor-in-cup), which is the configuration used for most commercial devices. Figure 1b shows a cross-sectional view of the dispersed phosphor particles surrounding a chip. Figure 1c shows a conformal phosphor layer, where the phosphor particles are coated directly onto the LED. A top view and cross-sectional view of the conformal layers produced by electrophoretic deposition (EPD) is shown in Figure 1d. A uniform, highly packed, conformal phosphor layer controls color and efficiency and improves the spatial color distribution of LEDs.2 For near-UV emitting diodes (370-410 nm), thicker phosphor layers must be used for the conformal or remote phosphor distribution so that no UV light escapes the device.The conformal and phosphor-in-cup distribution limits the light extraction efficiency of the device. Because the phosphor particles emit light in all directions, a large portion directly impinges on the LED chip where it can be re-absorbed (Figures 1a, 1c). This issue is critical in the conformal phosphor configuration due to the close proximity of the phosphor and the LED chip. If the phosphor is placed at a sufficiently large distance from the LED chip (remote phosphor configuration) the probability of light rays emanating from the phosphor and directly hitting the low reflectivity LED chip is small, improving the light extraction efficiency. Another advantage of the remote phosphor configuration is that it can reduce the operating temperature of the phosphor. Figure 1e shows a remote phosphor configuration, 3 in which a phosphor layer of uniform thickness is distributed over the reflector cup on a transparent substrate. However, there is still a probability of light rays being reflected by the reflector cup and being re-absorbed by the LED chip...

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Silica coated, water dispersible and photoluminescent Y (V,P)O₄:Eu³⁺,Bi³⁺nanophosphors

Cited by 55 publications

References 35 publications

Research challenges to ultra‐efficient inorganic solid‐state lighting

Research challenges to ultra‐efficient inorganic solid‐state lighting

Energy transfer process and optimum emission studies in luminescence of core–shell nanoparticles: YVO4:Eu–YVO4 and surface state analysis

Review—Electrophoretic Deposition of Phosphors for Solid-State Lighting

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