Structure, photoluminescence and abnormal thermal quenching behavior of Eu2+-doped Na3Sc2(PO4)3: a novel blue-emitting phosphor for n-UV LEDs

Wang, Xicheng; Zhao, Zhengyan; Wu, Quansheng; Wang, Chuang; Wang, Qian; Li, Yanyan; Wang, Yuhua

doi:10.1039/c6tc01049k

Cited by 153 publications

(87 citation statements)

References 41 publications

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“…Such a large value indicates that there is enough space to accommodate the energy level of Cr 3+ . [ 17 ] In addition, comparing with other atoms, Sc atoms make the most contribution to the conduction band (CB) (shown in Figure S5b, Supporting Information), which indicates that electronic orbitals within the ScO 6 octahedron are rather discrete. Thus, the Cr 3+ ions doped at the Sc 3+ site would also have a high possibility to generate and obtain free carriers through CB, [ 18 ] which is available for the long, persistent luminescence properties.…”

Section: Resultsmentioning

confidence: 99%

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Zhou

Geng

et al. 2020

Advanced Optical Materials

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High‐radiance near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are demanded for wearable biosensing devices and the properties of these pc‐LEDs are highly dependent on the performance of the NIR phosphor. An ultraviolet–visible and NIR‐responded broadband NIR NaScGe2O6:Cr3+ phosphor is reported. Under 490 nm excitation, NaScGe2O6:Cr3+ shows broad emission band from 700 to 1250 nm, which covers the first and second NIR windows. An NIR pc‐LED with radiant flux of 12.07 mW@350 mA is realized based on NaScGe2O6:Cr3+ and 450 nm blue LED chip. The ability of high‐power NIR light of the NIR pc‐LED to penetrate human tissues is observed successfully. Additionally, in NaScGe2O6:Cr3+, the luminescence performance of Cr3+ under 808 nm laser excitation is achieved for the first time.

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Section: Resultsmentioning

confidence: 99%

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Zhou

Geng

et al. 2020

Advanced Optical Materials

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111

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“…In addition, the critical distance ( R c ) equals to 11.4 Å based on the formula in supporting information, demonstrating that the energy transfer is mainly attributed to the multipolar interaction. According to Dexter's energy transfer formula

\frac{I_{S 0}}{I_{S}} \propto C^{\frac{θ}{3}}

in which I S0 and I S represent the emission intensity without and with Mn 4+ , C is the sum of Eu 3+ and Mn 4+ concentration. The values of θ = 6, 8, 10 correspond to dipole–dipole, dipole—quadrupole, and quadrupole–quadrupole interactions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Strategies for Designing Antithermal‐Quenching Red Phosphors

et al. 2020

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efficiency,low-energy consumption, long lifetime, and environmental compatibility, and so on. [1][2][3] The common w-LEDs devices are fabricated via two combination strategies: 1) blue LED chip and yellow phosphor; 2) nearultraviolet (n-UV) LED chip and tricolor phosphors. [4,5] No matter for which fabrication methods, the development of red phosphor is crucial to improve the lighting quality and tune corrected color temperature of w-LEDs. [6,7] To date, many researchers have focused on exploring highly efficient red phosphors. Although Eu 2+ -doped nitride phosphors such as CaAlSiN 3 :Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+[8-10] show high quantum yield (QY > 90%) and high thermal quenching temperature (>600 K), the harsh preparation conditions (high pressure ≥ 0.9-2.5 MPa; high temperature ≥1700-200 °C) and deepred emission position (beyond 650 nm) limit the large-scale application in indoor lighting. Eu 3+ -doped inorganic compounds are typical red-emitting phosphors due to the (4f 6 ) 5 D 0 → (4f 6 ) 7 F J spin-and parity-forbidden transition, [11,12] but it is hardly utilized in w-LEDs applications owing to the linearly narrow excitation and emission. [13,14] Mn 4+ has been considered as the promising red-emitting activator Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor-converted white light emitting diodes (w-LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal-quenching red emission in Eu 3+ , Mn 4+ -codoped phosphors is proposed.

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“…As shown in Figure D, Eg can be estimated according to the following equation:

{(α h v)}^{normaln} = A false(h v - E_{g} false)

where hν is the incident photon energy, and α is the absorption coefficient, A is a constant. The value of n depends on the type of inter‐band transition, for which n = 2 for a direct transition and n = 1/2 for an indirect transition . The absorption coefficient α can be obtained via the Kubelka–Munk function:

α = \frac{(1 - R^{2})}{2 R}

where R is the observed reflectance in the DRS measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The value of n depends on the type of inter-band transition, for which n = 2 for a direct transition and n = 1/2 for an indirect transition. 36 The absorption coefficient α can be obtained via the Kubelka-Munk function:…”

Section: Electronic Structure Of Cnlmentioning

confidence: 99%

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor

et al. 2019

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A novel apatite‐based UV‐excited dual‐emitting Ca2Na2La6(SiO4)4(PO4)2O: Eu2+/Eu3+ phosphor (CNL: Eu2+/Eu3+) was designed and successfully synthesized by a solid‐state reaction. Compared with previous reports on this family of materials, a structural study based on DFT calculation exhibited a new consequence that the monovalent ions in this system are more inclined to occupy the seven‐coordinate cationic sites rather than the nine‐coordinate sites. This result was confirmed by the structural refinement and high‐resolution transmission electron microscopy (HRTEM) data. Due to the coexistence of Eu2+ and Eu3+ dopants in the material, under 345 or 392 nm excitation, CNL: 0.02Eu2+/Eu3+ exhibited a green Eu2+ emission band (528 nm) and red Eu3+ emission peaks (around 618 nm). The application potential of CNL:0.02Eu2+/Eu3+ in luminescent thermometry was studied by exploiting the temperature sensitivity of the fluorescent intensity ratio (green/red) at different temperatures. It was found that, under 345 nm excitation, the fluorescent intensity ratio of CNL: 0.02Eu2+/Eu3+ displayed linear correlation over the temperature range of 298 to 473 K with a high sensitivity of 2.82%K−1. Additionally, the emission color of the CNL: 0.02Eu2+/Eu3+ sample under UV lamp (254 and 365 nm) excitation showed an obvious change (from green to red) as the temperature increased from 298 to 473 K (from green to red). These results indicated that CNL: Eu2+/Eu3+ can serve as an excellent visual luminescent ratiometric thermometer. Furthermore, this work provides a novel reference for developing high‐performance luminescence temperature‐sensing materials.

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Structure, photoluminescence and abnormal thermal quenching behavior of Eu²⁺-doped Na₃Sc₂(PO₄)₃: a novel blue-emitting phosphor for n-UV LEDs

Abstract: A novel blue-emitting phosphor Na3Sc2(PO4)3:Eu2+ was successfully synthesized by solid-state reaction.

Cited by 153 publications

References 41 publications

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Strategies for Designing Antithermal‐Quenching Red Phosphors

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor

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Structure, photoluminescence and abnormal thermal quenching behavior of Eu2+-doped Na3Sc2(PO4)3: a novel blue-emitting phosphor for n-UV LEDs

Abstract: A novel blue-emitting phosphor Na3Sc2(PO4)3:Eu2+ was successfully synthesized by solid-state reaction.

Cited by 153 publications

References 41 publications

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Strategies for Designing Antithermal‐Quenching Red Phosphors

Ca2Na2La6(SiO4)4(PO4)2O: Eu2+/Eu3+: A visual dual‐emitting fluorescent ratiometric temperature sensor

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Structure, photoluminescence and abnormal thermal quenching behavior of Eu²⁺-doped Na₃Sc₂(PO₄)₃: a novel blue-emitting phosphor for n-UV LEDs

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor