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Title: Monolithic translucent BaMgAl 10 O 17 :Eu 2+ phosphors for laser-driven solid state lighting

Authors:
; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1397291
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 10
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Cozzan, Clayton, Brady, Michael J., O’Dea, Nicholas, Levin, Emily E., Nakamura, Shuji, DenBaars, Steven P., and Seshadri, Ram. Monolithic translucent BaMgAl 10 O 17 :Eu 2+ phosphors for laser-driven solid state lighting. United States: N. p., 2016. Web. doi:10.1063/1.4964925.
Cozzan, Clayton, Brady, Michael J., O’Dea, Nicholas, Levin, Emily E., Nakamura, Shuji, DenBaars, Steven P., & Seshadri, Ram. Monolithic translucent BaMgAl 10 O 17 :Eu 2+ phosphors for laser-driven solid state lighting. United States. doi:10.1063/1.4964925.
Cozzan, Clayton, Brady, Michael J., O’Dea, Nicholas, Levin, Emily E., Nakamura, Shuji, DenBaars, Steven P., and Seshadri, Ram. Sat . "Monolithic translucent BaMgAl 10 O 17 :Eu 2+ phosphors for laser-driven solid state lighting". United States. doi:10.1063/1.4964925.
@article{osti_1397291,
title = {Monolithic translucent BaMgAl 10 O 17 :Eu 2+ phosphors for laser-driven solid state lighting},
author = {Cozzan, Clayton and Brady, Michael J. and O’Dea, Nicholas and Levin, Emily E. and Nakamura, Shuji and DenBaars, Steven P. and Seshadri, Ram},
abstractNote = {},
doi = {10.1063/1.4964925},
journal = {AIP Advances},
number = 10,
volume = 6,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}
  • With high power light emitting diodes and laser diodes being explored for white light generation and visible light communication, thermally robust encapsulation schemes for color-converting inorganic phosphors are essential. In the current work, the canonical blue-emitting phosphor, high purity Eu-doped BaMgAl 10O 17, has been prepared using microwave-assisted heating (25 min) and densified into translucent ceramic phosphor monoliths using spark plasma sintering (30 min). Lastly, the resulting translucent ceramic monoliths convert UV laser light to blue light with the same efficiency as the starting powder and provide superior thermal management in comparison with silicone encapsulation.
  • Starting from the aqueous solutions of metal nitrates with citric acid and polyethylene glycol (PEG) as additives, BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} (BAM:Eu{sup 2+}) phosphors were prepared by a two-step spray pyrolysis (SP) method. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectra were used to characterize the resulted BAM:Eu{sup 2+} phosphors. The obtained BAM:Eu{sup 2+} phosphor particles have spherical shape, submicron size (0.5-3{mu}m). The effects of process conditions of the spray pyrolysis, such as molecular weight and concentration of PEG, on the morphology and luminescence properties of phosphor particles were investigated. Adequate amount of PEG was necessary formore » obtaining spherical particles, and the optimum emission intensity could be obtained when the concentration of PEG was 0.03g/ml in the precursor solution. Moreover, the emission intensity of the phosphors increased with increasing of metal ion concentration in the solution. Compared with the BAM:Eu{sup 2+} phosphor prepared by citrate-gel method, spherical BAM:Eu{sup 2+} phosphor particles showed a higher emission intensity.« less
  • Highlights: ► Ideal hexagonal shape particle size in 5 μm and 2.5–3 μm in thickness are obtained. ► The growth mechanism is studied by a computer simulation. ► The influence of introduced AlN on the sites of Eu{sup 2+} and photoluminescence properties was investigated. - Abstract: The AlN-doped BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} phosphors were synthesized by conventional solid-state reaction. Powder X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectrum (PL) were used for characterization. The growth mechanism was carried out by computer simulation with CASTEP application, and revealed that an ideal hexagonal shape, particle size in 5 μm andmore » 2.5–3 μm in thickness, could be obtained by AlN doping. Additionally, due to the low electronegativity of N{sup 3−}, the AlN-doped sample showed 35% increase in PL intensity and improvement of thermal stability. These fine particle size and better photoluminescence properties are expected to be applicable to industrial production of BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} phosphors.« less
  • The mechanism of particle growth of the blue emitting BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} phosphor by firing with AlF{sub 3} has been clarified. It was found that the reaction between BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} and AlF{sub 3} during firing, on the basis of the following chemical equation, results in recreation of BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} with particle growth BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} + (4/3)AlF{sub 3} {l_reversible} BaMgF{sub 4}:Eu{sup 2+} + (17/3)Al{sub 2}O{sub 3}, the firing of Ba/MgAl{sub 10}O{sub 17}:Eu{sup 2+} with AlF{sub 3} first converts the phosphor into a mixture of the two compounds, BaMgF{sub 4}:Eu{sup 2+} and Al{sub 2}O{sub 3},more » at around 1200 C. The BaMgF{sub 4}:Eu{sup 2+} melts at temperatures over 1000 C, then reacts with Al{sub 2}O{sub 3}, and participates in the recreation of both BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} and AlF{sub 3} through a chemical reaction between the two compounds at 1200 C in BaMgF{sub 4}:Eu{sup 2+} solutions. Recreated AlF{sub 3} appears to sublime immediately because it is a material which sublimates with heating. This paper proposes a mechanism for the growth of particle of recreated BaMgAl{sub 10}O{sub 17}:Eu{sup 2+} by the melting of BaMgF{sub 4}:Eu{sup 2+}.« less