A promising yellow phosphor of Ce~(3+)/Li~+ doped CaSiN_(2-2δ/3)O_δ for pc-LEDs

Wang X.-M.; Zhang X.; Ye S.Jing X.-P.

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A promising yellow phosphor of Ce~(3+)/Li~+ doped CaSiN_(2-2δ/3)O_δ for pc-LEDs

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Single-phased orthorhombic nitridosilicate CaSiN_2 powders were prepared at 1550°C in a N_2/H_2 (6) atmosphere by solid-state reaction using Ca_3N_2 and Si_3N _4 as the starting materials. The crystal structure refinements were carried out by the Rietveld method based on the X-ray and neutron powder diffraction data collected at 297 K, respectively. The CaSiN_2 phase crystallizes in an orthorhombic unit cell with the space group Pbca (No. 61) and cell parameters a = 5.1334(3) ?, b = 10.3090(5) ?, c = 14.5756(5) ?, Z = 16 (XRD data). Instead of the ideal formula CaSiN_2, small amounts of oxygen could be detected in the samples. The O/N composition of orthorhombic CaSiN_(2-2δ/3)O_δ was analyzed by EDX and Rietveld refinement on the neutron powder diffraction data. SAED and HREM characterizations of the crystallites were conducted before the EDX analysis in order to select proper crystallites and exclude other minor second phases of (oxo)nitridosilicates such as cubic CaSiN_2 and monoclinic CaSi_2O_2N_2. The luminescence measurements indicate that Ce~(3+)/Li~+ co-doped CaSiN _(2-2δ/3)O_δ emits a typical shouldered yellow band peaking at 530 nm (FWHM ～ 120 nm), which originates from the 5d → 4f transition of Ce~(3+). The emission band shifts to longer wavelengths with an increment of Ce3+ concentration. The strong excitation band appears in the range of 350-470 nm, which is very favorable for the applications in near-UV and blue phosphor-converted light-emitting diodes (pc-LEDs).

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《Dalton transactions: An international journal of inorganic chemistry》 |2013年第14期|5167-5173|共7页
作者
Wang X.-M.; Zhang X.; Ye S.Jing X.-P.;
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作者单位

Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;

State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China;

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A promising yellow phosphor of Ce~(3+)/Li~+ doped CaSiN_(2-2δ/3)O_δ for pc-LEDs

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