New Pr3+ site in β-SiAlON red phosphor

Lazarowska, Agata; Mahlik, Sebastian; Grinberg, M.; Liu, Tzu-Chen; Liu, Ru‐Shi

doi:10.1016/j.optmat.2012.10.027

Cited by 11 publications

(11 citation statements)

References 17 publications

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“…Recently, Wang et al found that Eu 2+ is coordinated by nine nitrogen atoms, forming a highly symmetric EuN 9 polyhedron because of Eu 2+ , within the same plane as the Al and O atoms, having minimum stable energy. To date, in β-SiAlON:Eu, the consensus is that a single crystallographic site existed in the highly symmetric hexagonal channel for the Eu 2+ dopant, coordinated by nine (N,O) atoms. − However, it was still absent of direct evidence to prove the precise microenvironment of Eu 2+ in β-SiAlON. This fundamental question enables us to consider using the exhaustive photoluminescence measurements, such as high pressure and time-resolved spectroscopy, as an option to probe it. , …”

Section: Introductionmentioning

confidence: 99%

“…To date, in β-SiAlON:Eu, the consensus is that a single crystallographic site existed in the highly symmetric hexagonal channel for the Eu 2+ dopant, coordinated by nine (N,O) atoms. − However, it was still absent of direct evidence to prove the precise microenvironment of Eu 2+ in β-SiAlON. This fundamental question enables us to consider using the exhaustive photoluminescence measurements, such as high pressure and time-resolved spectroscopy, as an option to probe it. , …”

Section: Introductionmentioning

confidence: 99%

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Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

et al. 2017

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Narrow-band green-emitting phosphor β-SiAlON:Eu has been widely used in advanced wide-gamut backlighting devices. However, the origins for unusual sharp lines in photoluminescence emission at room temperature and tunable narrow-bandemission tailored by reducing Al-O in β-SiAlON:Eu are still unclear. Here, the presence of sharp-line fine structure in the emission spectra of β-SiAlON:Eu is mainly due to purely electronic transitions (zero phonon lines) and their vibronic repetitions resulted from the multi-microenvironment around Eu 2+ ions that has been revealed by relative emission intensity of sharp line depends on excitation wavelength and monotonously increasing decay time. The specific features of the Eu 2+ occupying interstitial sites indicate that the effect of crystal field strength can be neglected. Therefore the enhanced rigidity and higher ordering structure of β-SiAlON:Eu with decreasing the substitution of Si-N by Al-O become the main factors in decreasing electron-lattice coupling and reducing inhomogeneous broadening, favouring the blue-shift and narrow of the emission band, the enhanced thermal stability, as well as the charge state of Eu 2+ . Our results provide new insights for explaining the reason for narrow-band-emission in β-SiAlON:Eu, which will deliver an impetus for the exploration of phosphors with narrow band and ordering structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

et al. 2017

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“…13 Upon 451 nm excitation, the PL spectra indicate that the as-synthesized Na 2 CaTi 2 -Ge 3 O 12 :Pr 3+ phosphor exhibited four narrow red-emitting bands peaking at 595 ( 3 P 1 / 3 H 6 ), 609 ( 1 D 2 / 3 H 4 ), 622 ( 3 P 0 / 3 H 6 ) and 630 ( 3 P 1 / 3 F 2 ) nm, which correspond to the parityforbidden intra-conguration 4f 2 / 4f 2 transitions of the Pr 3+ ion. 14,15 The strongest emission line at 609 nm contributes to the 1 D 2 / 3 H 4 transition of the Pr 3+ ions in the red region.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Novel red-emitting garnet Na2CaTi2Ge3O12:Pr3+,Na+ phosphors

et al. 2014

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A series of red-emitting garnet Na 2 CaTi 2 Ge 3 O 12 :Pr 3+ ,Na + phosphors were synthesized by a hightemperature solid-state reaction. The crystal structure, luminescence properties, decay lifetime, and thermal stability were initially studied. The excitation spectra show one broad band centered at 337 nm and several sharp bands centered at 451, 462, 474 and 488 nm, which are ascribed to the 4f 2 / 4f 1 5d 1 and 4f 2 / 4f 2 transitions of Pr 3+ . The emission spectra show narrow band emissions centered at 595, 609, 622 and 630 nm, which correspond to the parity-forbidden intra-configuration 4f 2 / 4f 2 transitions of the Pr 3+ ion. The optimum concentration of Pr 3+ in Na 2 CaTi 2 Ge 3 O 12 :Pr 3+ ,Na + was determined to be 2 mol%. Upon excitation at 451 nm, the Na 2 CaTi 2 Ge 3 O 12 :Pr 3+ ,Na + phosphors exhibit an intense red emission at 609 nm with CIE chromaticity coordinates of (0.6524, 0.3457). The wider color gamut of the as-synthesized Na 2 CaTi 2 Ge 3 O 12 :Pr 3+ ,Na + is much higher than that of commercially available materials, such as CaSi 5 N 8 :Eu 2+ and CaAlSiN 3 :Eu 2+ . The results indicate that the novel redemitting phosphors could be a potential candidate for display applications.

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“…[23][24][25] Among them, the 1 D 2 -3 H 4 emission was studied most extensively, and its optimized emission efficiency was obtained at a Pr 3+ doping concentration of 0.2-1.0%. The three red emissions are from different origins of the 4f 2 -4f 2 transitions, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…1 D 2 -3 H 4 (603 nm), 3 P 0 -3 H 6 (617 nm) and 3 P 0 -3 F 2 (650 nm). [23][24][25] Among them, the 1 D 2 -3 H 4 emission was studied most extensively, and its optimized emission efficiency was obtained at a Pr 3+ doping concentration of 0.2-1.0%. [26][27][28][29] For a higher doping, concentration quenching effect will reduce the emission, because the odds of nonradiative energy transfer between Pr 3+ ions can be increased with Pr 3+ concentration.…”

Section: Introductionmentioning

confidence: 99%

White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles

Tang

Sun

et al. 2015

RSC Adv.

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Single-phase SrTiO 3 :mPr 3+ (m ¼ 0.01-0.1) nanoparticles have been synthesized by a hydrothermal method.Different from reported Pr 3+ -based phosphors which were all dominated by red emissions, considerably strong and overwhelming blue-green emission centered at 491 nm has been achieved together with minor green and red emissions. The absolute and relative intensities of these emissions can be modified by Pr 3+ concentrations and annealing temperatures in a controlled manner, giving rise to varied emission colors. In particular, owing to the appropriate combination of the blue to red emissions, desirable whitelight emission has been realized from the as-grown SrTiO 3 :0.01Pr 3+ and the annealed SrTiO 3 :0.06Pr 3+ samples at 350 C with CIE chromaticity coordinates of (0.33, 0.35) and (0.35, 0.37) and a correlated color temperature of 5601 K and 4883 K, respectively, indicating the promising application potential of SrTiO 3 :Pr 3+ as single-phase phosphors for white light-emitting-diodes. This work may provide a fresh route to acquire white emission from a single-composition phosphor. † Electronic supplementary information (ESI) available: Structural parameters of SrTiO 3 :mPr 3+ at room temperature rened with Pm3m space group, size distribution of the SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of the as-grown SrTiO 3 :0.06Pr 3+ monitored at 603 nm 617 nm and 650 nm, PL of the as-grown SrTiO 3 :0.06Pr 3+ sample under 447 nm excitation, SEM image of 1350 C annealed SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 491 nm, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 617 nm, PL of the 1350 C annealed SrTiO 3 :0.06Pr 3+ sample under 490 nm excitation, CIE chromaticity diagram and chromaticity coordinates (x, y) of emission from SrTiO 3 :0.06Pr 3+ annealed at 1350 C (under 490 nm excitation), XRD patterns of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples, structural parameters of as-grown and annealed SrTiO 3 :0.06Pr 3+ rened with Pm3m space group, and the energy level diagram of Pr 3+ ions. See

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New Pr3+ site in β-SiAlON red phosphor

Cited by 11 publications

References 17 publications

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Novel red-emitting garnet Na2CaTi2Ge3O12:Pr3+,Na+ phosphors

White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles

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New Pr3+ site in β-SiAlON red phosphor

Cited by 11 publications

References 17 publications

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Controlling of Structural Ordering and Rigidity of β-SiAlON:Eu through Chemical Cosubstitution to Approach Narrow-Band-Emission for Light-Emitting Diodes Application

Novel red-emitting garnet Na2CaTi2Ge3O12:Pr3+,Na+ phosphors

White-light-emitting properties of SrTiO3:Pr3+ nanoparticles

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Product

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White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles