Dual energy transfer controlled photoluminescence evolution in Eu and Mn co-activated β-Ca2.7Sr0.3(PO4)2 phosphors for solid-state lighting. Issue 119 (17th November 2015)

• Record Type: Journal Article
• Authors: Han, Jin; Pan, Fengjuan; Zhou, Wenli; Qiu, Zhongxian; Tang, Miao; Wang, Jing; Lian, Shixun
• Is Part Of: RSC advances. Volume 5:Issue 119(2015)
• Page Start: 98026
• Page End: 98032
• Publication Date: 2015-11-17
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra17877k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Photoluminescence evolution of a single-composition phosphor for solid state lighting can be realized through a dual energy transfer strategy. Abstract : Photoluminescence evolution in single-composition phosphors for solid state lighting can be realized through an energy transfer strategy, which is commonly based on one sensitizer and one activator. In this work, we focus on a dual energy transfer process, that is, energy transfers from the sensitizer Eu 2+ at two different cation sites to the activator Mn 2+ at another site in whitlockite-type β-Ca2.7 Sr0.3 (PO4 )2 . Firstly, we refined the crystal structure of the β-Ca2.7 Sr0.3 (PO4 )2 host by a Rietveld method. Then we studied the phase, morphology and photoluminescence of Eu and Mn co-activated β-Ca2.7 Sr0.3 (PO4 )2 phosphors, which are synthesized by a conventional solid-state reaction. By adjusting the ratio of Eu 2+ /Mn 2+, the emission hue can be controlled from cyan (0.211, 0.281) to white-light (0.332, 0.290) and eventually to red (0.543, 0.276). The dual energy transfers from Eu 2+ to Mn 2+ are demonstrated to be dipole–dipole and quadrupole–quadrupole mechanisms, respectively. Moreover, white light-emitting diodes (LEDs) were fabricated through the integration of a 375 nm NUV chip and the white-emitting phosphor Ca2.7 Sr0.3 (PO4 )2 :0.008Eu 2+, 0.03Mn 2+ into a single package, which shows a warm white light with color coordinates of (0.40, 0.41) and correlated color temperature of 3731 K.