Ammonolysis-free synthesis of La2O2CN2 by cyanamidation of La(OH)3 using urea, and its photoluminescence properties

Ceramics International Volume 45 Issue 7 Page 9325-9329 published_at 2019-05
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Title ( eng )
Ammonolysis-free synthesis of La2O2CN2 by cyanamidation of La(OH)3 using urea, and its photoluminescence properties
Creator
Okada Ryoki
Kawanishi Kodai
Source Title
Ceramics International
Volume 45
Issue 7
Start Page 9325
End Page 9329
Abstract
A facile method was successfully developed to prepare lanthanum oxycyanamide, La2O2CN2. Urea was selected as a cyanamidation agent, instead of gaseous NH3 with graphite containers, to achieve a safe and simple synthetic strategy. Through the optimization of reaction conditions, including content of urea and heat-treatment temperature, single-phase La2O2CN2 could be obtained without any impurities. We also prepared a La2O2CN2:Eu3+ phosphor. The Eu3+-doped La2O2CN2 matrix showed a red emission. Furthermore, in comparison with La2O3:Eu3+, the photoluminescence excitation bands corresponding to the Eu3+–ligand charge transfer region were broadened. These results suggested that La2O2CN2 prepared via the urea route will offer superb application prospects for photoluminescence materials such as white light-emitting diodes.
Keywords
Oxycyanamide
Carbodiimide
Mixed anion compound
Phosphor
Urea
Descriptions
This work was supported by JSPS KAKENHI Grant Numbers JP17H05483 and JP17H03392. This work was partly supported by the Center for Functional Nano Oxide at Hiroshima University, Japan.
アクセプト後にキーワードの変更あり。
Language
eng
Resource Type journal article
Publisher
Elsevier
Date of Issued 2019-05
Rights
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 0272-8842
[DOI] 10.1016/j.ceramint.2019.01.262
[DOI] https://doi.org/10.1016/j.ceramint.2019.01.262
Remark Post-print version/PDF may be used in an institutional repository after an embargo period of 24 months.