Chen X.,Center for Advanced Optoelectronic Functional Materials Research |
Dai P.,Center for Advanced Optoelectronic Functional Materials Research |
Zhang X.,Center for Advanced Optoelectronic Functional Materials Research |
Li C.,Center for Advanced Optoelectronic Functional Materials Research |
And 4 more authors.
Inorganic Chemistry | Year: 2014
A series of single-phased (Sr3-x,Ca1-y-z,Ba)(PO 4)3Cl (SCBPO-Cl):xEu2+, yTb3+, zMn2+ phosphors were synthesized by high-temperature solid-state reaction, and luminescent properties of these phosphors were investigated by means of photoluminescence and microcathode luminescence (μ-CL). Under UV excitation, white-light emission was obtained from triactivated SCBPO-Cl phosphors via combining three emission bands centered at 450, 543, and 570 nm contributed by Eu2+, Tb3+, and Mn2+, respectively. White-light emission with the three emission bands is further demonstrated in the fluorescence microscope images, CL spectrum, and μ-CL mappings, which strongly confirm that the luminescence distribution of as-prepared SCBPO-Cl:xEu2+, yTb3+, zMn2+ phosphors is very homogeneous. Both spectral overlapping and lifetime decay analyses suggest that dual energy transfers, that is, Eu2+→ Tb3+ and Eu2+→Mn2+, play key roles in obtaining the white emission. The International Commission on Illumination value of white emission as well as luminescence quantum yield (51.2-81.4%) can be tuned by precisely controlling the content of Eu2+, Tb3+, and Mn2+. These results suggest that this single-phased SCBPO-Cl:xEu2+, yTb3+, zMn2+ phosphor may have a potential application as a near-UV convertible white-light emission phosphor for phosphor-converted white light-emitting diode. © 2014 American Chemical Society. Source