Improved full-color emission and switched luminescence in single Ca3(PO4)2: Dy3+, Eu3+ phosphors for white LEDs

Wu, Jiadong; Zhang, Le; Ben, Yue; Chen, Hao; Fu, Xian‐Zhu; Wong, Ching‐Ping

doi:10.1016/j.jallcom.2016.12.135

Cited by 47 publications

(8 citation statements)

References 22 publications

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“…These results further prove the existence of energy transfer from Dy 3+ to Eu 3+ . Similar dependence is also observed for other Dy 3+ /Eu 3+ co‐doped glass host …”

Section: Resultssupporting

confidence: 84%

“…Similar dependence is also observed for other Dy 3+ /Eu 3+ co-doped glass host. 23,[39][40][41] An energy level diagram for the f−f transitions of Dy 3+ and Eu 3+ and the possible energy-transfer process are sketched in Figure 8. Under 387 nm excitation, Dy 3+ ions are excited from its ground state 6 H 15/2 directly to higher 4 I 13/2 + 4 F 7/2 excited states.…”

Section: Decay Curvesmentioning

confidence: 99%

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Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

et al. 2019

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A series of Dy3+/Eu3+ single‐ and co‐doped calcium borosilicate luminescent glasses were prepared by the conventional high temperature melt‐quenching method. A compact glass structure is obtained by the addition of Dy3+/Eu3+ ions, which is verified by the physical properties of synthetic glasses. As network modifiers, Dy3+/Eu3+ fill in the interspaces of glass network and contribute to the conversion of [BO3] to [BO4]. Dy3+/Eu3+ co‐doped calcium borosilicate glasses can emit white light, which consists of blue, yellow, and red light under 387 nm excitation. The emission spectra and decay curves of the white‐emitting glasses have proved the existence of energy transfer. The average lifetime of Dy3+ decreases from 0.251 to 0.165 ms with the increasing Eu3+ concentration. Changing rare earth ions concentration, CIE color coordinates of Dy3+/Eu3+ co‐doped glass shifts from cyan to white with increasing excitation wavelength. A white‐light emission is obtained when the concentration of Dy3+ and Eu3+ equals to 4% and 2%, respectively. Moreover, the Dy3+/Eu3+ co‐doped calcium borosilicate glass shows high‐thermal stability and it may be applicable for high‐quality white LEDs based on high power near ultraviolet (n‐UV) LED chip in the future.

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“…These results further prove the existence of energy transfer from Dy 3+ to Eu 3+ . Similar dependence is also observed for other Dy 3+ /Eu 3+ co‐doped glass host …”

Section: Resultssupporting

confidence: 84%

Section: Decay Curvesmentioning

confidence: 99%

Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

et al. 2019

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“…The function of a single-component white phosphor generally relies on their interaction, especially energy transfer, between the rare-earth ions in an appropriate host. Until now, many studies related to rare-earth-doped phosphate phosphors − have been conducted in search of novel single-component white phosphors, mainly due to high absorption in the UV region and structural diversity of the phosphate host. Nevertheless, few of them are suitable for commercial use, and most of these phosphors usually suffer some characteristic deficiencies, such as synthetic processing (requiring inert atmosphere protection) and emission loss or shift with increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…7595(2) Å, c = 12.5931(3) Å, â= 108.546(2)°, V = 1032.56(5) Å3 , and Z = 4.In the asymmetric unit of MgIn 2 P 4 O 14 , there exist 11 crystallographically independent atom sites. All of the sites except only one special site 4e, which is co-occupied by Mg1 and In1 atoms (denoted as M1), belong to general sites 8f.…”

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confidence: 99%

Layered Crystal Structure, Color-Tunable Photoluminescence, and Excellent Thermal Stability of MgIn₂P₄O₁₄ Phosphate-Based Phosphors

et al. 2017

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Single-component white phosphors stand a good chance to serve in the next-generation high-power white light-emitting diodes. Because of low thermal stability and containing lanthanide ions with reduced valence state, most of reported phosphors usually suffer unstable color of lighting for practical packaging and comparably complex synthetic processes. In this work, we present a type of novel color-tunable blue-white-yellow-emitting MgInPO:Tm/Dy phosphor with high thermal stability, which can be easily fabricated in air. Under UV excitation, the MgInPO:TmDy white phosphor exhibits negligible thermal-quenching behavior, with a 99.5% intensity retention at 150 °C, relative to its initial value at room temperature. The phosphor host MgInPO was synthesized and reported for the first time. MgInPO crystallizes in the space group of C2/c (No. 15) with a novel layered structure built of alternate anionic and cationic layers. Its disordering structure, with Mg and In atoms co-occupying the same site, is believed to facilitate the energy transfer between rare-earth ions and benefit by sustaining the luminescence with increasing temperature. The measured absolute quantum yields of MgInPO:Dy, MgInPO:TmDy, and MgInPO:TmDy phosphors under the excitation of 351 nm ultraviolet radiation are 70.50%, 53.24%, and 52.31%, respectively. Present work indicates that the novel layered MgInPO is a promising candidate as a single-component white phosphor host with an excellent thermal stability for near-UV-excited white-light-emitting diodes (wLEDs).

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“…Recently, there has been increasing interest in developing phosphor-converted white-light-emitting diodes, the next generation illumination source, to substitute conventional incandescent and fluorescent lamps, which are fabricated based on the employment of different color-emitting phosphors and light-emitting diode (LED) chips, because of their exceptional merits such as high energy conversion efficiency from electricity to light, a long working lifetime, environment-friendliness, compactness, robustness and so forth. − Currently, enrolling the a InGaN blue chip with the yellow-light-emitting phosphor YAG:Ce has been the easiest and most common approach to achieve a w-LED . Unfortunately, the white light produced using the above method faces deficiencies including a low color-rendering index (CRI < 80) and a high correlated color temperature (CCT > 4500 K) owing to the shortage of the red-emission component in its luminescence spectrum, which is bad for its further vivid applications in many fields. , Therefore, some researchers devoted to the development of red phosphors including Eu 2+ /Ce 3+ -doped nitride/oxy-nitride and Mn 4+ -doped fluoride that can be excited by blue light to compensate the red component in the aforementioned way, − however, harsh synthesis conditions such as a high temperature, a reduced atmosphere, and even a high pressure for Eu 2+ /Ce 3+ -doped phosphors are often indispensable, and the raw materials containing HF for synthesizing Mn 4+ -doped fluoride are harmful to the environment.…”

Section: Introductionmentioning

confidence: 99%

Color Tuning from Greenish-Yellow to Orange-Red in Thermal-Stable KBaY(MoO₄)₃:Dy³⁺, Eu³⁺ Phosphors via Energy Transfer for UV W-LEDs

Deun

2020

ACS Appl. Electron. Mater.

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In this report, a series of tunable-emitting KBaY(MoO 4 ) 3 :Dy 3+ , Eu 3+ (KBYMO:Dy 3+ , Eu 3+ ) phosphors were synthesized via a Pechini-type sol−gel reaction approach. XRD and Rietveld refinement results confirm the pure phase of as-prepared materials. Upon 351 nm excitation, the optimal sample KBYMO:0.05Dy 3+ shows its two main characteristic emission bands around 488 and 573 nm, which correspond to Dy 3+ transitions 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 , respectively, in addition to a weak band around 660 nm originating from Dy 3+ 4 F 9/2 → 6 H 11/2 transition. In the excitation spectrum monitored at 573 nm, it is worth noting that there are two excitation peaks at 365 and 453 nm, matching with commercial LED chips. With the addition of Eu 3+ into KBYMO:0.05Dy 3+ , the energy transfer from Dy 3+ to Eu 3+ is elucidated, resulting in the tunable emission color from greenish-yellow to orange-red with increasing Eu 3+ content upon a 365 nm UV lamp excitation, which can be proved by analyzing the profiles of the excitation and emission spectra of Dy 3+ , Eu 3+ codoped KBYMO and the decay times of Dy 3+ . The energy-transfer mechanism is determined to be a quadrupole−quadrupole interaction according to Dexter theory and Reisfield's approximation. Moreover, the temperaturedependent luminescence property of representative KBYMO:0.05Dy 3+ , 0.10Eu 3+ is evaluated, which presents an emission intensity maintenance of 82.8% at 423 K relative to room temperature 298 K, showing its good performance. These results indicate that the as-prepared KBYMO:Dy 3+ , Eu 3+ phosphors may be a candidate component applied in UV w-LEDs.

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Improved full-color emission and switched luminescence in single Ca3(PO4)2: Dy3+, Eu3+ phosphors for white LEDs

Cited by 47 publications

References 22 publications

Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

Layered Crystal Structure, Color-Tunable Photoluminescence, and Excellent Thermal Stability of MgIn₂P₄O₁₄ Phosphate-Based Phosphors

Color Tuning from Greenish-Yellow to Orange-Red in Thermal-Stable KBaY(MoO₄)₃:Dy³⁺, Eu³⁺ Phosphors via Energy Transfer for UV W-LEDs

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Improved full-color emission and switched luminescence in single Ca3(PO4)2: Dy3+, Eu3+ phosphors for white LEDs

Cited by 47 publications

References 22 publications

Tunable colors and applications of Dy3+/Eu3+ co‐doped CaO‐B2O3‐SiO2 glasses

Tunable colors and applications of Dy3+/Eu3+ co‐doped CaO‐B2O3‐SiO2 glasses

Layered Crystal Structure, Color-Tunable Photoluminescence, and Excellent Thermal Stability of MgIn2P4O14 Phosphate-Based Phosphors

Color Tuning from Greenish-Yellow to Orange-Red in Thermal-Stable KBaY(MoO4)3:Dy3+, Eu3+ Phosphors via Energy Transfer for UV W-LEDs

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Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

Tunable colors and applications of Dy³⁺/Eu³⁺ co‐doped CaO‐B₂O₃‐SiO₂ glasses

Layered Crystal Structure, Color-Tunable Photoluminescence, and Excellent Thermal Stability of MgIn₂P₄O₁₄ Phosphate-Based Phosphors

Color Tuning from Greenish-Yellow to Orange-Red in Thermal-Stable KBaY(MoO₄)₃:Dy³⁺, Eu³⁺ Phosphors via Energy Transfer for UV W-LEDs