Photoluminescence properties and energy transfer of Ce3+, Eu2+ co-doped Sr3Gd(PO4)3 phosphor

Sun, Jiayue; Zeng, Junhui; Sun, Yining; Du, Haiyan

doi:10.1016/j.jallcom.2012.06.040

Cited by 32 publications

(18 citation statements)

References 20 publications

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“…Figure b shows the PLE intensity of the silicate phosphor at 546 nm. The intensity gradually increased as the particle size increased, and the highest intensity was observed at 450 nm because Eu 2+ electrons are best excited from the 4f ground state to the 5d excited state at 450 nm . Currently, the most widely used white LEDs use blue LED chips with light emission in this wavelength band as excitation sources, which are manufactured to have the best excitation efficiency around 450 nm.…”

Section: Resultsmentioning

confidence: 99%

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Jang

Kim

Kang

et al. 2013

Int J Applied Ceramic Tech

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Understanding the effect of particle size on the optical properties of phosphor is important to increase packaging efficiency in white light-emitting diodes (LEDs). We have investigated the effect of particle size (10-20 lm, 20-25 lm, 25-32 lm) on the optical properties of a yellow silicate phosphor adopted in white LEDs. X-ray diffraction results show negligible modification in crystallinity as the particle size of the yellow silicate phosphor varies, whereas the photoluminescence excitation intensity and quantum yield are enhanced as the particle size increased. LED packages fabricated using phosphors with different mean particle sizes, and their optical properties were analyzed. The radiant flux improved with increasing particle size, whereas the luminous flux increased with decreasing particle size. The effect of immersion on the optical properties of the LED light source has been also measured, and the details are discussed.

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Section: Resultsmentioning

confidence: 99%

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Jang

Kim

Kang

et al. 2013

Int J Applied Ceramic Tech

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“…9 is likely to be the resonant energy transfer from Ce 3+ to Eu 2+ . 27 The concentration of Ce 3+ is xed at 0.003 with tuning the concentrations of Eu 2+ The redshi is owing to the following two factors: the rst one is that the high energy of excitation would be absorbed by Ce 3+ ions and then converted to lower energy to excite Eu 2+ ions; the second one is that the Eu-N/O bonds become more covalent as a result of using the larger Ce 3+ ions to substitute for the second-neighbor Li + ions around activator ion. The covalence of Eu-N/O bonds and the crystal eld splitting effect are progressively enhanced by the neighbor-cation control, resulting in the observed red-shiing in the emission energy.…”

Section: Characterizationmentioning

confidence: 99%

Novel optical characteristics of Eu²⁺doped and Eu²⁺, Ce³⁺co-doped LiSi₂N₃phosphors by gas-pressed sintering

Wang

et al. 2014

RSC Adv.

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Eu 2+ doped and Eu 2+ , Ce 3+ co-doped LiSi 2 N 3 phosphors were successfully prepared by gas-pressed sintering in this study. The dominant excitation band of LiSi 2 N 3 :Eu 2+ was found at about 355 nm and exhibited a broad-band yellow emission centered at 592 nm instead of the early reports of 310 nm and 580 nm, respectively. The shifting behavior dominantly contributed to different oxygen content in the host. The second luminescent center formed by the introduction of oxygen into nitride phosphors was discussed in detail. The detailed energy transfer mechanism from Ce 3+ to Eu 2+ in the LiSi 2 N 3 host is also reported and a notable unusual redshift behavior was observed in Eu 2+ , Ce 3+ co-doped LiSi 2 N 3 phosphors.

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“…The energy transfer mechanism has been cited as dipole-dipole [for example, ref. 5, 7 and 8], dipole-quadrupole 9 and quadrupolequadrupole. 10 It is noted that the use of the approximate formula 5,10 to determine the energy transfer mechanism sometimes does not provide adequate distinction between various mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Luminescence, cathodoluminescence and Ce3+ → Eu2+ energy transfer and emission enhancement in the Sr5(PO4)3Cl:Ce3+,Eu2+ phosphor

et al. 2013

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Ultraviolet and vacuum ultraviolet spectra are reported for Ce 3+ and Eu 2+ singly doped into the Sr 5 (PO 4 ) 3 Cl lattice, synthesized by a solid-state process. The maxima of the emission intensities are at 346 nm (Ce 3+ ) and 442 nm (Eu 2+ ), with lifetimes of 25 ns and 494 ns, respectively. The Ce 3+ excitation spectra exhibit five bands assigned to vibronic structures of the 4f 1 / 5d 1 electronic transition, in addition to the host absorption at 166 nm at 295 K. The 5d centroid shift is similar to that in SrCl 2 :Ce 3+ . The Eu 2+ excitation spectrum is mainly comprised of two 4f 7 / 4f 6 5d broad bands between 200 nm and 450 nm, peaking at 343 nm and 275 nm.Both of the singly doped systems exhibit concentration quenching, with energy transfer rates being in the low (ms) À1 range for concentrations up to 4 at.% of total cations. The energy transfer rates are linearly and quadratically related to dopant ion concentrations of Ce 3+ and Eu 2+ , respectively. The energy transfer between Ce 3+ and Eu 2+ in the co-doped Sr 5 (PO 4 ) 3 Cl lattice has been studied by the analysis of intensity and decay measurements of both Ce 3+ and Eu 2+ emissions. The electric dipole-electric dipole transfer has an efficiency of 91% in Sr 4.8Àx Ce 0.01 Eu x Na 0.01 (PO 4 ) 3 Cl, with a critical distance of 21 Å. Although energy transfer between Ce 3+ and Eu 2+ upon excitation into the overlapping Ce 3+ /Eu 2+ absorption band is definitely demonstrated by the dramatic shortening of Ce 3+ lifetime, the emission of Eu 2+ is also enhanced at low Ce 3+ concentrations using exclusive excitation into the Eu 2+ absorption band. The quantum yields (QY) of the co-doped system approach those of BaMgAl 10 O 17 :Eu 2+ (BAM) for the excitation wavelengths of 317 and 365 nm, but are inferior for 254 nm excitation. The addition of 1 at.% Ce 3+ to Sr 4.98 Eu 0.02 (PO 4 ) 3 Cl increases the QY by $20% of the original value. The cathodoluminesce of the co-doped phosphor is comparable to that of BAM, with CIE coordinates of the emission (0.274, 0.237), so that the application as a field emission display phosphor is proposed.

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Photoluminescence properties and energy transfer of Ce3+, Eu2+ co-doped Sr3Gd(PO4)3 phosphor

Cited by 32 publications

References 20 publications

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Novel optical characteristics of Eu²⁺doped and Eu²⁺, Ce³⁺co-doped LiSi₂N₃phosphors by gas-pressed sintering

Luminescence, cathodoluminescence and Ce3+ → Eu2+ energy transfer and emission enhancement in the Sr5(PO4)3Cl:Ce3+,Eu2+ phosphor

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Photoluminescence properties and energy transfer of Ce3+, Eu2+ co-doped Sr3Gd(PO4)3 phosphor

Cited by 32 publications

References 20 publications

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Effect of Particle Size on the Optical Properties of Yellow Silicate Phosphor in Light‐Emitting Diodes

Novel optical characteristics of Eu2+doped and Eu2+, Ce3+co-doped LiSi2N3phosphors by gas-pressed sintering

Luminescence, cathodoluminescence and Ce3+ → Eu2+ energy transfer and emission enhancement in the Sr5(PO4)3Cl:Ce3+,Eu2+ phosphor

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Product

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Novel optical characteristics of Eu²⁺doped and Eu²⁺, Ce³⁺co-doped LiSi₂N₃phosphors by gas-pressed sintering