Journal Highlight: Fabrication of wideband near-infrared phosphor by stacking Sm³⁺-doped glass on Pr³⁺-doped glass phosphors

Fabrication of wideband near-infrared phosphor by stacking Sm³⁺-doped glass on Pr³⁺-doped glass phosphors

physica status solidi (c), 2012, 9, 2340-2343
Koji Oshima, Kengo Terasawa, Shingo Fuchi, Yoshikazu Takeda

Abstract: We synthesized the Pr³⁺-doped Bi₂O₃-Sb₂O₃-B₂O₃ glass phosphor and the Sm³⁺-doped CaO-Sb₂O₃-B₂O₃ glass phosphor in order to fabricate a wideband luminescence. The luminescence bands of the Pr³⁺-doped glass phosphor were from 760 nm to 910 nm and from 920 nm to 1100 nm. The luminescence bands of the Sm³⁺-doped glass phosphor were from 840 nm to 1060 nm. The excitation band of the Pr³⁺-doped glass phosphor coincided with that of the Sm³⁺-doped glass phosphor at around 475 nm. We achieved the wideband luminescence from 760 nm to 1100 nm by stacking the Pr³⁺-doped glass phosphor (0.1 mol% Pr₆O₁₁, 10 mm) on the Sm³⁺-doped glass phosphor (0.5 mol% Sm₂O₃, 10 mm) excited by one LED (470 nm). This luminescence covered the wavelength region that is suitable for the absorption spectrometry of agricultural products.

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