Li4SrCa(SiO4)2:Ce3+, a highly efficient near-UV and blue emitting orthosilicate phosphor

Zhang, Jilin; Zhang, Weilu; Qiu, Zhongxian; Zhou, Wenli; Yu, Liping; Li, Zhiqiang; Lian, Shixun

doi:10.1016/j.jallcom.2015.05.280

Cited by 42 publications

(9 citation statements)

References 43 publications

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“…In addition, the intensity of most of peaks is stronger in the PiG coating than those in the phosphor. The difference suggests better crystalline when the phosphor is sintered …”

Section: Resultsmentioning

confidence: 99%

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Zhuo

et al. 2018

J Am Ceram Soc

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A gradient refractive index (GRIN) structure, with a gradual increase in the refractive index from the glass substrate, was successfully obtained by multilayer screen printing for white light‐emitting diodes (w‐LEDs) packaging. Each phosphor‐in‐glass (PiG) coating consisted of B2O3–SiO2–ZnO glass matrix and yellow phosphor. The gradually increased refractive index (1.62, 1.72, and 1.82) of glass matrices were obtained from higher molecular weight of La2O3 and WO3. After sintering at 600°C, no obvious interface was observed and the phosphor particles were mixed thoroughly in the glass matrix. When the phosphor content was 50 wt%, the white‐light emission was obtained. Compared with those based on the nongradient and low‐refractive PiG coating, the luminous efficacy of w‐LEDs constructed by the PiG coating with GRIN was enhanced. It shows that the GRIN structure is beneficial to improve the luminous efficacy of w‐LEDs.

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“…In addition, the intensity of most of peaks is stronger in the PiG coating than those in the phosphor. The difference suggests better crystalline when the phosphor is sintered …”

Section: Resultsmentioning

confidence: 99%

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Zhuo

et al. 2018

J Am Ceram Soc

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“…The Sr and Ca sites are coordinated by 10 and 6 oxygen atoms with C s and C i symmetries, respectively. Luminescence properties of the material singly doped with Eu 2+ , Tb 3+ , or Ce 3+ have been previously reported. − In the Ce-doped system, the near-UV emission at 345 nm and the blue emission at 420 nm were ascribed to Ce 3+ located at the Sr and Ca sites, respectively, based on an empirical relationship between the lowest 4f → 5d transition energy and the local coordination structure . Since the measurements were performed at room temperature (RT), the fine spectral features that were required for a quantitative analysis of the structure–property relationship were missing in the UV excitation spectra, as a result of the temperature-induced band broadening.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Ce-Doped Li₄SrCa(SiO₄)₂: A Combined Experimental and Theoretical Study

et al. 2018

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Investigation of optical properties of Ce-activated phosphors is not only of practical importance for various applications but also of fundamental importance for providing a basis to understand relevant properties of other lanthanide ions in the same host. We report herein a combined experimental and theoretical study of optical properties of Ce in LiSrCa(SiO). Photoluminescence properties of the material prepared by a solid-state reaction method are investigated with excitation energies in the vacuum-ultraviolet (VUV) to ultraviolet (UV) range at low temperatures. The band maxima in the excitation spectra are assigned with respect to 4f → 5d transitions of Ce at the Sr and Ca sites, from comparison between experimental and ab initio predicted transition energies. As a result of the two-site occupation, the material displays luminescence at 300-500 nm with a high thermal quenching temperature (>500 K), consistent with the calculated large gaps (∼1.40 eV) between the emitting 5d levels and the bottom of the host conduction band. On the basis of experimental and calculated results for Ce in LiSrCa(SiO), the energy-level diagram for the 4f ground states and the lowest 5d states of all trivalent and divalent lanthanide ions at the Sr and Ca sites of the same host is constructed and discussed in association with experimental findings.

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“…The energy transfer efficiency of η T from the Eu 3 þ to Dy 3 þ ions can be obtained experimentally by the decay lifetime, and estimated from the equation [29]:…”

Section: Photoluminescence Mechanism Of Eu 3 þ /Dy 3 þ Co-doped Znwo mentioning

confidence: 99%

Fabrication and Luminescent properties of ZnWO 4 :Eu 3+ , Dy 3+ white light-emitting phosphors

Zhai

Wang

Zhao

et al. 2016

Journal of Luminescence

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Li4SrCa(SiO4)2:Ce3+, a highly efficient near-UV and blue emitting orthosilicate phosphor

Cited by 42 publications

References 43 publications

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Optical Properties of Ce-Doped Li₄SrCa(SiO₄)₂: A Combined Experimental and Theoretical Study

Fabrication and Luminescent properties of ZnWO 4 :Eu 3+ , Dy 3+ white light-emitting phosphors

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Li4SrCa(SiO4)2:Ce3+, a highly efficient near-UV and blue emitting orthosilicate phosphor

Cited by 42 publications

References 43 publications

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Gradient refractive index structure of phosphor‐in‐glass coating for packaging of white LEDs

Optical Properties of Ce-Doped Li4SrCa(SiO4)2: A Combined Experimental and Theoretical Study

Fabrication and Luminescent properties of ZnWO 4 :Eu 3+ , Dy 3+ white light-emitting phosphors

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Optical Properties of Ce-Doped Li₄SrCa(SiO₄)₂: A Combined Experimental and Theoretical Study