Synthesis of Y6-xCa1.5xSi11N20O:Ce3+ (x = 0 ~ 2.5) Oxynitride Phosphor with Broad Emission Wavelength for 1pc-LED

Joonseo Park; Jin-Woong Lee

doi:10.3740/MRSK.2021.31.4.188

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2021 Vol.31, Issue 4 Preview Page Next Page

Synthesis of Y_6-xCa_1.5xSi₁₁N₂₀O:Ce³⁺ (x = 0 ~ 2.5) Oxynitride Phosphor with Broad Emission Wavelength for 1pc-LED

April 2021. pp. 188-194

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Abstract

A Y_6-xCa_1.5xSi₁₁N₂₀O:Ce³⁺(x=2.5) oxynitride phosphor is synthesized at 1,750 °C in a mixed gas atmosphere of 5% H₂ and 95 % N₂ by using YN, Ca₃N₂, Si₃N₄, and CeO₂ as raw material reagents. The crystal structure is a trigonal crystal system that has a _P31_c (no.159) space group and has lattice parameters of a, b = 9.8876(3), and c = 10.6806(4). This structure is an Er₆Si₁₁N₂₀O structure type in which a Y_6-xCa_1.5xSi₁₁N₂₀O structure is formed by substituting a trivalent Y³⁺ element and a bivalent Ca²⁺ element at the position of Er element having an oxidation number of +3. Here, the charge difference caused by different oxidation numbers is balanced by the occupancy of a partially vacant 2c site and an O/N anion ratio in the Er₆Si₁₁N₂₀O structure type. The Y_6-xCa_1.5xSi₁₁N₂₀O:Ce³⁺ (x = 2.5) phosphor is yellow powder with yellow luminescence; performing Rietveld refinement on the phosphor on the basis of the data obtained by XRD measurement results in the lattice parameters as described above. The Y_6-xCa_1.5xSi₁₁N₂₀O:Ce³⁺ (x = 2.5) phosphor has a broad emission band due to Ce³⁺ as an activator with the center wavelength of 565 nm. This phosphor has a broader emission band than a YAG:Ce³⁺ phosphor, which is a representative LED phosphor, and thus extends further into the blue and red spectrum ranges. Accordingly, this phosphor is an interesting phosphor that can be used for 1pc-LED with an improved color rendering index.

Keywords

oxynitride phosphor

rietveld refinement

density functional theory

color rendering index

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 31
No :4
Pages :188-194
Received Date : 2021-03-08
Revised Date : 2021-03-08
Accepted Date : 2021-03-22
DOI :https://doi.org/10.3740/MRSK.2021.31.4.188

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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