A broad band yellow-emitting Sr8CaBi(PO4)(7):Eu2+ phosphor for n-UV pumped white light emitting devices

作者：Zhang, Qiang; Wang, Xicheng; Ding, Xin; Wang, Yuhua^*

来源：Dyes and Pigments, 2018, 149: 268-275.

DOI：10.1016/j.dyepig.2017.10.004

• SrsCaBi(PO4)(7)
• Eu2+
• Photoluminescence
• Yellow-emitting
• White LED

A novel broad band yellow-emitting Sr8CaBi(PO4)(7):Eu2+ (SCBP:Eu2+) phosphor was synthesized via conventional high-temperature solid-state reaction. It's crystal structure and phase were investigated with X-ray diffraction (XRD), Rietveld refinement method and transmission electron microscopy (TEM). The photoluminescence spectra as well as fluorescence decay curves were measured and discussed. The SCBP:Eu2+ phosphor can exhibit a broad excitation band in the range from 260 to 425 nm, while the emission spectrum exhibits a broad asymmetric yellow emission band peaking at 606 nm under 400 nm excitation. By analyzing their structure and fluorescence decay lifetimes, five different Eu2+ luminescence centers in SCBP:Eu2+ phosphor were confirmed. Then the concentration quenching mechanism as well as the thermal stability has been discussed in detail. Furthermore, a white LED lamp which can exhibit good performance has been fabricated via combining a 400 nm near-ultraviolet (n-UV) chip with the commercial BAM:Eu2+ phosphor and the present SCBP:0.04Eu(2+)sample. These results suggest that the SCBP:Eu2+ can be a promising yellow-emitting n-UV phosphor for white light emitting diodes.

• 出版日期2018-2
• 单位兰州大学