Synthesis and Property of CaSi2O2N2:Ce/Tb, Eu Stacking Luminescence Fibers

doi:10.15541/jim20170227

Abstract

Abstract:

By adjusting composition of spinning solution and spinning time, CaSi₂O₂N₂:Ce/Tb, Eu stacking fluorescent fibers for white LEDs were prepared through multi-step electrospinning and gas-reduction procedures. The obtained samples were characterized by SEM, TEM, XRD, and PL. The obtained sample keeps fiber morphology, and assembles as film at macro level. TEM images show that the fluorescent fibers consist of nanocrystalline. XRD patterns demonstrate that CaSi₂O₂N₂ crystal can be prepared through nitridizing at 1300℃ for 1 h, and its phase can be maintained after doping CeTb/Eu ions. Both sides of the CaSi₂O₂N₂:Ce/Tb, Eu stacking fluorescent fiber mats emit different light under the N-UV excitation light. The Eu ion doping side exposed to the exciting light can effectively undercut the emitting light reabsorption process of the fiber-stacking mat. It demonstrates that white light will be emitted when CaSi₂O₂N₂:Ce/Tb, Eu fluorescent fiber stacking mats are applied in a white light emitting diodes with N-UV chip.

Key words: stacking structure, electrospinning, luminescence fiber, oxynitride

CLC Number:

TB34

CUI Bo, JIA Wei, CHEN Zheng-Hua, LI Yao-Gang, ZHANG Qing-Hong, WANG Hong-Zhi. Synthesis and Property of CaSi₂O₂N₂:Ce/Tb, Eu Stacking Luminescence Fibers[J]. Journal of Inorganic Materials, 2018, 33(4): 403-408.

Figures/Tables 10

Fig. 1 SEM images of as-formed fiber precursor (a) and the samples after removing the organic template (b)

Fig. 2 SEM image of as-prepared CaSi2O2N2 fiber mats (a), TEM image (b) and cross section SEM image (c), the illustrative scheme for the stacking fiber mats (d) with inset showing the photo of the fiber films under ultraviolet light

Fig. 3 XRD patterns of CaSi2O2N2 phosphors doping with Ce/Tb, Eu and standard XRD pattern (PDF 44-0117)

Fig. 4 Excitation and emission spectra of CaSi2O2N2:Ce3+, CaSi2O2N2:Tb3+ fiber mats (a), Ce3+/Tb3+ side (b) and Eu2+ side (c) of CaSi2O2N2:Ce3+/Tb3+, Eu2+ fiber mats with inset showing the photo of the fiber films under the ultraviolet light

Fig. 5 Schematic illustration for luminescence measurement of films

Fig. 6 Excitation and emission spectra of Ce3+/Tb3+ side (a), (b) and Eu2+ side (c), (d) of CaSi2O2N2:Ce3+/Tb3+, Eu2+ fiber mats tested by reflection test and transmission test

Fig. 7 Emission spectra of stacking structure fiber mats excitaed on Ce/Tb side (a) and Eu side (b)

Fig. 8 Emission spectra of CaSi2O2N2:Ce3+/Tb3+, Eu2+ stacking fiber mats and Ce3+/Tb, Eu fiber blend mats

Table 1 Electroluminescence properties of LED lamps using CaSi2O2N2 : Ce3+/Tb3+, Eu2+ fiber mats

Thickness ratio (Ce/Tb:Eu)	Correlated color temperature/K	CIE value (x, y)
4 : 1	11674	(0.2594, 0.3019)
1 : 1	5674	(0.3284, 0.3456)
1 : 4	3740	(0.4388, 0.5230)

Fig. 9 CIE chromaticity coordinates of CaSi2O2N2:Ce3+/Tb3+, Eu2+ samples. The lighting pictures of three LEDs with CaSi2O2N2:Ce3+/Tb3+, Eu2+ fiber mats at a drive current of 100 mA

References 12

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Synthesis and Property of CaSi₂O₂N₂:Ce/Tb, Eu Stacking Luminescence Fibers

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