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2013•Journal of Applied PhysicsOpen access

Near infrared photoluminescence from bismuth-doped nanoporous silica thin films

Sa Chu Rong Gui, Kenji Imakita, Minoru Fujii, Zhenhua Bai, Shinji Hayashi

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Abstract

Photoluminescence (PL) properties of bismuth (Bi) doped porous silica thin films annealed at various temperatures and in different atmospheres were studied. The near infrared (NIR) luminescence depended strongly on the annealing atmosphere and temperature. To reveal the origin of the NIR luminescence, we performed comprehensive PL studies including steady state and time-resolved PL measurements at 8–300 K in wide excitation (250–500 nm) and detection (400–1550 nm) wavelength ranges. It was revealed that multiple Bi luminescence centers, such as Bi3+, Bi2+, Bi+, and Bi dimer, are stabilized in porous silica.

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Photoluminescence (PL) properties of bismuth (Bi) doped porous silica thin films annealed at various temperatures and in different atmospheres were studied. The near infrared (NIR) luminescence depended strongly on the annealing atmosphere and temperature. To reveal the origin of the NIR luminescence, we performed comprehensive PL studies including steady state and time-resolved PL measurements at 8–300 K in wide excitation (250–500 nm) and detection (400–1550 nm) wavelength ranges. It was revealed that multiple Bi luminescence centers, such as Bi3+, Bi2+, Bi+, and Bi dimer, are stabilized in porous silica.

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Available abstract

Photoluminescence (PL) properties of bismuth (Bi) doped porous silica thin films annealed at various temperatures and in different atmospheres were studied. The near infrared (NIR) luminescence depended strongly on the annealing atmosphere and temperature. To reveal the origin of the NIR luminescence, we performed comprehensive PL studies including steady state and time-resolved PL measurements at 8–300 K in wide excitation (250–500 nm) and detection (400–1550 nm) wavelength ranges. It was revealed that multiple Bi luminescence centers, such as Bi3+, Bi2+, Bi+, and Bi dimer, are stabilized in porous silica.

Key concepts: Photoluminescence, Luminescence, Materials science, Nanoporous, Annealing (glass), Bismuth, Doping, Infrared

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