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Issue 15, 2018
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Enhanced luminescence performance of CaO:Ce3+,Li+,F phosphor and its phosphor-in-glass based high-power warm LED properties

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Abstract

To obtain white light-emitted diodes (wLEDs) with a low correlated color temperature (CCT) and a high color rendering index (CRI), red-emission is indispensable in their emission spectra. Herein, CaO:Ce3+,Li+,F yellow phosphors with more red spectral component have been prepared via a high temperature solid-state reaction. As compared to the F undoped samples, CaO:Ce3+,Li+,F phosphor have lower critical doping concentration of Ce3+ and show stronger luminescence. At the critical concentration, a quantum efficiency of 66.4% and enhanced thermal and chemical stability were obtained in CaO:Ce3+,Li+,F. Furthermore, a CaO:Ce3+,Li+,F-based phosphor-in-glass (PiG) using the red-emitting glass system with the composition of SiO2–Na2CO3–Al2O3–CaO:Eu3+ as the host material was constructed and used for high-power white LED applications. Such PiG samples with different phosphor doping concentrations can satisfy various light color demands and display higher reliability than the CaO:Ce3+,Li+,F phosphor. An optimal PiG-based wLED exhibits color coordinates of (0.3769, 0.3386), a CCT of 3774 K, a CRI of 82.5 and a LE of 73.1 when the mass ratio of phosphor to glass matrix was 7 : 50 in PiG. Moreover, such PiG-based wLED also showed acceptable color stability under different drive currents. All the above results demonstrate that CaO:Ce3+,Li+,F can be expected to be a potential alternative yellow phosphor for blue light excited PiG based warm wLEDs, particularly for high-power devices.

Graphical abstract: Enhanced luminescence performance of CaO:Ce3+,Li+,F− phosphor and its phosphor-in-glass based high-power warm LED properties

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Publication details

The article was received on 15 Feb 2018, accepted on 05 Mar 2018 and first published on 06 Mar 2018


Article type: Paper
DOI: 10.1039/C8TC00813B
Citation: J. Mater. Chem. C, 2018,6, 4077-4086
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    Enhanced luminescence performance of CaO:Ce3+,Li+,F phosphor and its phosphor-in-glass based high-power warm LED properties

    J. Deng, H. Zhang, X. Zhang, M. S. Molokeev, J. Qiu, Y. Liu, B. Lei, L. Ma and X. Wang, J. Mater. Chem. C, 2018, 6, 4077
    DOI: 10.1039/C8TC00813B

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