Effect of A+ (A = Li, Na and K) co-doping on the luminescence enhancement of CaSr2(PO4)2:Dy3+ phosphors for white light-emitting diodes

Dai, Siyi; Zhang, Wentao; Zhou, Desheng; Yan, Guilin; Liu, Sutian

doi:10.1016/j.ceramint.2017.08.097

Cited by 21 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the introduction of Na + ions leads to the decrease of non-radiative transition probability and correspondingly the enhancement of the Dy 3+ emission. 27 The results also show that the introduction of the Na + ions can modify the relative emission intensity of the yellow and blue light of the Dy 3+ ions. Here, a factor of R is introduced to characterize the ratio of the emission intensity of the 4 F 9/2 ?…”

Section: Resultsmentioning

confidence: 77%

“…While, the incorporation of Na + ions can neutralize the charge of the system and thus prevent the formation of such vacancies, which can be expressed as the following equation: Dy Dy × (no charge) + 2Ca Ca × (no charge) + Na Na × (no charge) → Dy Ca • (one positive charge) + Na Ca ’ (one negative charge). Thus, the introduction of Na + ions leads to the decrease of non‐radiative transition probability and correspondingly the enhancement of the Dy 3+ emission …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

et al. 2018

View full text Add to dashboard Cite

The Dy‐ and Eu‐activated Ca3B2O6 phosphors were synthesized by a high‐temperature solid‐state reaction technique and their structural and luminescent properties were investigated. The phosphors are characterized by X‐ray diffraction, photoluminescence spectra, and Commission International de I'Eclairage (CIE) chromaticity coordinates. It is found that the charge compensator Na+ plays an important role in modifying the emission spectral profiles of Dy and Eu ions in the phosphors. The ratio of the emission located at the yellow wavelength portion to that located at the blue wavelength region of the Dy3+ ions can be apparently tuned by changing the Na+ content. The luminescence intensity of the phosphors can be enhanced with introducing Na+ ions as well. The emission colors of Dy/Eu codoped phosphors change from blue to white and successfully acquire the superior white light emission (x = 0.330, y = 0.329) by appropriately tuning the Na+/Dy3+ content and the excitation wavelength. The energy transfer process from Eu2+ to Dy3+ and Eu3+ occurs in the Dy/Eu codoped phosphors, providing a further approach to modify the emission spectral profile of the examined phosphors. The phosphors presented here have promising applications in the fields of light‐emitting diodes.

show abstract

Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

et al. 2018

View full text Add to dashboard Cite

show abstract

“…On the basis of literature studies and the summary of knowledge, we found that similar to the M 3 (PO 4 ) 2 (M = Ca, Sr, Ba) structure [28][29], among which CaSr 2 (PO 4 ) 2 is also a suitable host for phosphors [30]. The effect of Li + , Na + and K + co-doping on the luminescence enhancement of CaSr 2 (PO 4 ) 2 :Dy 3+ phosphors for white light-emitting diodes has been reported [31]. However, the focus was on the effect of the phosphor reinforcing agent.…”

Section: Introductionmentioning

confidence: 88%

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

Guo

Chen

Hao

et al. 2021

Preprint

View full text Add to dashboard Cite

Single-phase CaSr2(PO4)2:Dy3+,Li+ phosphors were prepared using the high-temperature solid-state method in the air. To characterize the luminescence properties of the synthesized phosphors, Powder X-ray diffraction patterns (XRD), scanning electron microscopy images (SEM), photoluminescence spectra, and concentration-dependent emission spectra were measured to characterize the luminescence properties of the synthesized phosphors. The results showed that the CaSr2(PO4)2:Dy3+,Li+ phosphors exhibited white luminescence, and the emission spectra of the phosphors consisted of two sharp peaks at ≈486 and ≈578 nm (the most intense one). The optimum concentration of Dy3+ doping was determined to 0.06 mol.%. On the basis of the Dexter's theory, the mechanism of energy transfer between the Dy3+ ions was determined to dipole–dipole interactions. The results of the temperature-dependent luminescence confirmed that the as-prepared phosphors are proved to be promising UV-convertible material capable of white light emitting in UV-LEDs due to its excellent thermal stability and luminescence properties. Luminescence intensity and decay time of the CaSr2(PO4)2:Dy3+,Li+ phosphors were improved remarkably with the addition of charge compensators (Li+ ions), which would promote their applications in white light-emitting diodes based on the near-UV chip.

show abstract

“…Alkali metal ions (Li + , Na + , and K + ) as appropriate flux or charge compensators can enhance the luminous efficiency of phosphors. [17][18][19][20] In this article, a series of far-red-emitting SISO:xMn 4+ , M (M = Li + , Na + , and K + ) phosphors with a good luminescence performance were synthesized. The potential of the obtained phosphors for plant cultivation was discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, antimonite with a double perovskite structure can serve as a candidate host because of appropriate physical and chemical stability. Alkali metal ions (Li + , Na + , and K + ) as appropriate flux or charge compensators can enhance the luminous efficiency of phosphors 17–20 . In this article, a series of far‐red‐emitting SISO: x Mn 4+ , M (M = Li + , Na + , and K + ) phosphors with a good luminescence performance were synthesized.…”

Section: Introductionmentioning

confidence: 99%

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

et al. 2021

View full text Add to dashboard Cite

High‐efficiency and far‐red light phosphors based on Mn4+‐doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+‐doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+‐activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far‐red‐emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far‐red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far‐red‐phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors‐based plant growth light‐emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

show abstract

Effect of A+ (A = Li, Na and K) co-doping on the luminescence enhancement of CaSr2(PO4)2:Dy3+ phosphors for white light-emitting diodes

Cited by 21 publications

References 36 publications

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

Contact Info

Product

Resources

About

Effect of A+ (A = Li, Na and K) co-doping on the luminescence enhancement of CaSr2(PO4)2:Dy3+ phosphors for white light-emitting diodes

Cited by 21 publications

References 36 publications

Dy and Eu activated Ca3B2O6 phosphors for near ultraviolet‐based light‐emitting diodes

Dy and Eu activated Ca3B2O6 phosphors for near ultraviolet‐based light‐emitting diodes

Crystal Structure and Luminescence Properties of a Thermally Stable Single-Phase White Emitting Phosphor CaSr2(PO4)2: Dy3+, Li+

An efficient far‐red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

Contact Info

Product

Resources

About

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

Dy and Eu activated Ca₃B₂O₆ phosphors for near ultraviolet‐based light‐emitting diodes

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs