Highly efficient red emission and multiple energy transfer properties of Dy3+/Mn4+ co-doped Ca14Zn6Ga10O35 phosphors. Issue 28 (20th March 2017)

• Record Type: Journal Article
• Authors: Zhou, Yiyang; Zhao, Weiren; Chen, Junhua; Liao, Zifeng
• Is Part Of: RSC advances. Volume 7:Issue 28(2017)
• Page Start: 17244
• Page End: 17253
• Publication Date: 2017-03-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra02112g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Novel Dy 3+ /Mn 4+ co-doped Ca14 Zn6 Ga10 O35 phosphors have been synthesized by a solid state reaction technique. Abstract : Novel Dy 3+ /Mn 4+ co-doped Ca14 Zn6 Ga10 O35 phosphors have been synthesized by a solid state reaction technique. Strong blue emission ranging from 370 nm to 500 nm was observed for the Ca14 Zn6 Ga10 O35 host, attributed to the recombination of a donor–acceptor pair through a tunneling process. High internal and external quantum efficiencies of 64.4% and 56.2% respectively were obtained under the excitation of 310 nm in Mn 4+ doped Ca14 Zn6 Ga10 O35 . This external quantum efficiency is the highest one reported for Mn 4+ doped oxides. The temperature-dependent quantum efficiency of Ca14 Zn6 Ga10 O35 :Mn 4+ is also measured, indicating the unchanged absorption of the excitation light with temperature. In Ca14 Zn6 Ga10 O35 :Dy 3+, Mn 4+ phosphors, multiple energy transfer from the host to Dy 3+ and from Dy 3+ to Mn 4+ is observed and is confirmed to be a result of the dipole–dipole interaction. The emission changes from deep blue to white to deep red according to the different Dy 3+ /Mn 4+ concentration ratio, and the warm white emission can be realized with the chromaticity coordinate (0.345, 0.275), CCT 3525 K and CRI 87. These results suggest that Ca14 Zn6 Ga10 O35 :Mn 4+ phosphors have potential application as high efficiency red phosphors for solid-state lighting, while Dy 3+ /Mn 4+ co-doped Ca14 Zn6 Ga10 O35 phosphors can be used as a single-phased white phosphor.