NDLI: A promising yellow phosphor of $Ce^{3+}/Li^{+}$ doped $CaSiN_{2−2δ/3}O

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ye, Shi Jing, Xi-ping Zhang, Xue Wang, Xiao-ming
Description	Author Affiliation: Wang XM ( Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.)
Abstract	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 $Ca_{3}N_{2}$ and $Si_{3}N_{4}$ 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) Å, b = 10.3090(5) Å, c = 14.5756(5) Å, 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 $CaSi_{2}O_{2}N_{2}.$ 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 $Ce^{3+}$ 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).
ISSN	14779226
Issue Number	14
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-04-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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