(BaSr) 2 SiO 4 :Eu 2+ nanorods with enhanced luminescence properties as green-emitting phosphors for white LED applications

Pavitra, E.; Raju, G. Seeta Rama; Oh, Juhyun; Bharat, L. Krishna; Jeong, Jung Hyun; Huh, Yun Suk; Yu, Jae Su

doi:10.1016/j.dyepig.2017.03.065

Cited by 34 publications

(5 citation statements)

References 33 publications

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“…The CIE chromaticity coordinates were calculated to be (0.6148, 0.3844) falling in the red region (Figure 7d). It is worth mentioning that the full-width at half-maximum (fwhm) of PL spectrum is only 70 nm, comparable with recently reported phosphors NaZn(PO 3 ) 3 :Mn 2+ (67 nm), 24 (BaSr) 2 SiO 4 :Eu 2+ (71 nm), 34 Ca 2 LaHf 2 Al 3 O 12 :Ce 3+ (67 nm), 35 and Sr 2 [BeAl 3 N 5 ]:Eu 2+ (65−73 nm). 36 This indicates that phosphor CMP:0.2Mn 2+ is suitable to be used for LED backlight display.…”

Section: ■ Experimental Sectionsupporting

confidence: 87%

Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

et al. 2021

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Within Mn-activated phosphors, the oxidation state of Mn dopant strongly depends on the structural features of the host lattice. This paper reported a new polymorph of CsMg(PO 3 ) 3 (CMP) with a complicated three-dimensional (3D) framework of [Mg(PO 3 ) 3 ] ∞ that is constructed by MgO 6 octahedra and 1D infinite [PO 3 ] ∞ chains. Then we prepared a series of red phosphors CsMg 1−x (PO 3 ) 3 :xMn 2+ (CMP:xMn 2+ ) by high temperature solid state reactions in the open air. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) studies revealed the single Mn 2+ -oxidation. Under 404 nm light exciting, CMP:0.2Mn 2+ can emit single-band emission at around 630 nm with full-width at half-maximum (fwhm) of 70 nm. Besides, CMP:0.2Mn 2+ possesses excellent thermostability up to 450 K. These features indicate that CMP:0.2Mn 2+ is suitable to be used for LED backlight display. Moreover, this work suggests that a host lattice with suitable structure feature can form single Mn 2+ -oxidation and is rigid enough to protect Mn 2+ from being oxidized by O 2 at high temperature.

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Section: ■ Experimental Sectionsupporting

confidence: 87%

Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

et al. 2021

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“…The traditional wLEDs are prepared by combining a blue LED chip with yellow‐emitting Y 3 Al 5 O 12 : Ce 3+ (YAG: Ce 3+ ) phosphors . Another approach for producing wLEDs is via combining red‐, green‐, and blue‐emitting phosphors with a near ultraviolet (NUV) LED chip . However, commercial used silicate, aluminate, and phosphate phosphors employed in wLEDs usually suffer from poor thermal stability due to emission intensity loss, which greatly restricts the development of their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor

et al. 2018

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The thermal quenching properties and mechanisms of phosphors employed in white light emitting diodes (wLEDs) are critical for their commercial application. Here, we attempted to characterize the deep traps for capturing and releasing carriers to improve the thermal stability of the blue-emitting CaAl 2 O 4 : Eu 2+ , Tm 3+ phosphors. The enhanced thermal stability contributed to the introduction of traps has been demonstrated, and the mechanism of the transport process of carriers, has been explored in detail. In comparison with Eu 2+ doped sample, the co-doped Tm 3+ samples bring more deep traps. The releasing of carriers in deep traps therefore sustains the luminescence with increasing temperature and compensates the thermal luminescence intensity loss. The results provide a theoretical basis and new field of view for exploring excellent thermal stability phosphors for wLEDs.

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“…Especially for yellowish‐orange Cs 2 Ba 0.2 Ca 0.8 P 2 O 7 :0.01Eu 2+ , the IQY reaches as high as 98.9%. As shown in Table 2 , the IQY values of as‐prepared phosphors are higher than the previous green and yellow phosphors . Those results mean that the color‐tunable green‐to‐yellowish‐orange phosphors could obtain high luminescence efficiency through local lattice modulation method.…”

Section: Resultsmentioning

confidence: 82%

“…Therefore, many researchers have dedicated to exploring highly efficient green/yellowish‐orange phosphors. The commercial BaSrSiO 4 :Eu 2+ (λ em = 512 nm), β‐SiAlON:Eu 2+ (λ em = 540 nm), Ba 3 Si 6 O 12 N 2 :Eu 2+ (λ em = 527 nm), Ca‐α‐SiAlON:Eu 2+ (λ em = 581 nm), and YAG:Ce 3+ (λ em = 565 nm) phosphors exhibit bright green or yellowish‐orange light. But their QY values and thermal stability are still not ideal.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Green‐to‐Yellowish‐Orange Emitting Eu²⁺‐Doped Pyrophosphate Phosphors with Superior Thermal Quenching Resistance for w‐LEDs

Wei

Gao

Liu

et al. 2020

Advanced Optical Materials

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Highly efficient green/yellowish‐orange phosphors with low thermal quenching behavior are urgently required to improve the luminescence efficiency, color stability, and color rendering of phosphor‐converted white light emitting diodes (w‐LEDs). Herein, a novel green Cs2BaP2O7:0.01Eu2+ phosphor with high luminescence efficiency (82.7%) and thermal quenching behavior (92.5% at 423 K) is reported. Besides, a further luminescence improvement in the quantum yield (98.9%) and thermal quenching resistance (120% at 448 K) is successfully achieved in green/yellowish‐orange color‐tunable Cs2MP2O7:0.01Eu2+ (M = Ba, Sr, and Ca) phosphors. Surprisingly, these green/yellowish‐orange Cs2MP2O7:0.01Eu2+ (M = Ba, Sr, and Ca) phosphors even have a prior advantage over the commercial green β‐SiAlON:Eu2+ and yellow YAG:Ce3+ phosphors. The corresponding spectral adjustment and thermal stability mechanisms are revealed, related to the optimization of local lattice symmetry. The prototype w‐LEDs exhibit warm white light with CIE color coordinate at (0.337, 0.322). The color rendering index, corrected color temperature, and luminescence efficiency can reach 92.6, 4044 K, and 152.56 lm W−1, respectively. In general, the as‐reported green/yellowish‐orange Eu2+‐doped pyrophosphate phosphors are promising candidates in the future high‐quality w‐LEDs applications. The proposal of local lattice symmetry modulation can provide a new approach to exploit novel phosphors with excellent thermal quenching resistance.

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(BaSr) 2 SiO 4 :Eu 2+ nanorods with enhanced luminescence properties as green-emitting phosphors for white LED applications

Cited by 34 publications

References 33 publications

Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor

Highly Efficient Green‐to‐Yellowish‐Orange Emitting Eu²⁺‐Doped Pyrophosphate Phosphors with Superior Thermal Quenching Resistance for w‐LEDs

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(BaSr) 2 SiO 4 :Eu 2+ nanorods with enhanced luminescence properties as green-emitting phosphors for white LED applications

Cited by 34 publications

References 33 publications

Designing a Polyphosphate Polymorph of CsMg(PO3)3 as Host Lattice for Preparing Single Mn2+-Oxidation Doped Phosphor in the Open Environment

Designing a Polyphosphate Polymorph of CsMg(PO3)3 as Host Lattice for Preparing Single Mn2+-Oxidation Doped Phosphor in the Open Environment

Effects of the deep traps on the thermal‐stability property of CaAl2O4: Eu2+ phosphor

Highly Efficient Green‐to‐Yellowish‐Orange Emitting Eu2+‐Doped Pyrophosphate Phosphors with Superior Thermal Quenching Resistance for w‐LEDs

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Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

Designing a Polyphosphate Polymorph of CsMg(PO₃)₃ as Host Lattice for Preparing Single Mn²⁺-Oxidation Doped Phosphor in the Open Environment

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor

Highly Efficient Green‐to‐Yellowish‐Orange Emitting Eu²⁺‐Doped Pyrophosphate Phosphors with Superior Thermal Quenching Resistance for w‐LEDs