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In recent years, Cr3+-activated phosphors have been attracting a lot of interest due to their unique optical features that can be exploited for applications ranging from lasers to optical thermometry, near-infrared (NIR) emitting phosphors for bioimaging and NIR-LEDs, to name a few. Despite the interesting optical properties shown by Cr3+-doped Ga2O3, investigations are limited only to β-Ga2O3 and α-Ga2O3 polymorphs. Using mesoporous silica particles with different pore sizes between 3 nm and 22 nm as nanoreactors, cubic γ-Ga2O3:Cr3+ spinel nanocrystals (NCs) are stabilized through confinement into the mesopores as confirmed by HR-TEM, XRPD and the photoluminescence spectral shape. A detailed spectroscopic investigation in the temperature range between 16 to 500 K allowed extrapolating the fundamental parameters in the framework of the Tanabe–Sugano diagram and comparing the values for Cr3+ in γ-Ga2O3 with the α- and β-phases. In addition, due to the confinement of the NCs into the silica structure, the phase transition to the β-phase, conventionally occurring at about 700 °C, is hindered up to 1000 °C, improving the stability of the γ-Ga2O3 phase.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: nanocrystals, luminescence

刊行年月日: 2024-06-18

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Journal of Materials Chemistry C (ISSN: 20507526) vol. 12 issue. 29 p. 10929-10941

研究助成金:

• Programma Operativo Nazionale Ricerca e Competitività CATHENA project
• Programma Operativo Nazionale Ricerca e Competitività CUP: J34I17000010006
• Japan Society for the Promotion of Science S22088

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/d4tc01386g

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更新時刻: 2024-10-10 16:31:07 +0900

MDRでの公開時刻: 2024-10-10 16:31:07 +0900