Stabilizing cubic γ-Ga2O3:Cr3+ spinel nanocrystals by size confinement into mesoporous silica nanoreactor channels

Michele Crozzolin; Camilla Belloni; Jian Xu; Takayuki Nakanishi; Jumpei Ueda; Setsuhisa Tanabe; Federico Dallo; Eleonora Balliana; Asia Saorin; Flavio Rizzolio; Davide Cristofori; Pietro Riello; Alvise Benedetti; Michele Back

doi:10.1039/d4tc01386g

論文 Stabilizing cubic γ-Ga₂O₃:Cr³⁺ spinel nanocrystals by size confinement into mesoporous silica nanoreactor channels

Michele Crozzolin ; Camilla Belloni ; Jian Xu ; Takayuki Nakanishi (National Institute for Materials Science) ; Jumpei Ueda ; Setsuhisa Tanabe ; Federico Dallo ; Eleonora Balliana ; Asia Saorin ; Flavio Rizzolio ; Davide Cristofori ; Pietro Riello ; Alvise Benedetti ; Michele Back

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Michele Crozzolin, Camilla Belloni, Jian Xu, Takayuki Nakanishi, Jumpei Ueda, Setsuhisa Tanabe, Federico Dallo, Eleonora Balliana, Asia Saorin, Flavio Rizzolio, Davide Cristofori, Pietro Riello, Alvise Benedetti, Michele Back. Stabilizing cubic γ-Ga₂O₃:Cr³⁺ spinel nanocrystals by size confinement into mesoporous silica nanoreactor channels. Journal of Materials Chemistry C. 2024, 12 (29), 10929-10941. https://doi.org/10.1039/d4tc01386g

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(abstract)

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.

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