Promising color controllable phosphors CBSOCNy:Eu2+ with excellent thermal stability

Aijun Mao; Zhengyan Zhao; Takatoshi Seto; Yuhua Wang

Materials & Design (Oct 2019)

Promising color controllable phosphors CBSOCNy:Eu2+ with excellent thermal stability

Aijun Mao,
Zhengyan Zhao,
Takatoshi Seto,
Yuhua Wang

Affiliations

Aijun Mao: Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, Lanzhou University, Lanzhou, China
Zhengyan Zhao: Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, Lanzhou University, Lanzhou, China
Takatoshi Seto: Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
Yuhua Wang: Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, Lanzhou University, Lanzhou, China; Corresponding author at: Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.

Journal volume & issue: Vol. 180

Abstract

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Novel Ca1.96(B1-ySiy)(O3-yNy)Cl:0.04Eu2+ phosphors were designed and synthesized by introducing [Si4++N3−]/[B3++O2−] co-substitutions into Ca2BO3Cl:Eu2+ lattice. Fourier Transform Infrared Spectroscopy (FTIR) show that typical planar [BO3]3− units gradually transformed into [BO4]5− units with the increase of y, which was firstly realized in luminescence materials. Uneven expansion of cell parameters a,b, and c were confirmed by the combination of X-ray diffraction spectra (XRD) and results of Rietveld refinement. Structure variation caused smaller centroid shift (εc) and 5d energy level splitting (εcfs), inducing the narrowing of excitation spectra (y = 0 → y = 0.2, 168 → 144 nm) and blue-shift of emission spectra (y = 0 → y = 0.2, 582 → 525 nm). Excellent thermal stability (6% loss at 150 °C) was obtained, which resulted from more covalent bonding. Using the combination of representative sample CBSOCN0.2: 0.04Eu2+ and red K2SiF6:Mn4+ in a blue LED driven lamp, white light with high CRI ~92.8 and color temperature closed to the summer sun (5770 K) was obtained. Keywords: W-LEDs, Borates, Photo-luminescence

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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