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Enhancement of Optical Telecommunication Bands: Pr<sup>3+</sup>-Doped Halide Phosphate Glasses Display Broadband NIR Photoluminescence Emission
oleh: Bilel Charfi, Kamel Damak, Ramzi Maâlej, Mohammed S. Alqahtani, Khalid I. Hussein, Ali M. Alshehri, Abdulrahman M. Hussain, Bozena Burtan-Gwizdala, Manuela Reben, El Sayed Yousef
Format: | Article |
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Diterbitkan: | MDPI AG 2022-09-01 |
Deskripsi
In the optical energy gap, visible and near-IR emission of halide phosphate glasses with a composition of 40P<sub>2</sub>O<sub>5</sub>-30ZnO-20LiCl-10BaF<sub>2</sub> in mol% doped with 3.5 × 10<sup>4</sup> ppm Pr<sub>2</sub>O<sub>3</sub>, referred to as PZLBPr, were synthesized. The UV-VIS-NIR and spectroscopic properties of these glasses were also predicted. The current glasses had broadband emission photoluminescence covering a wavelength range of 1250 to 1700 nm when excited at 455 nm. These bands for near-infrared emission luminescence relate to the transitions <sup>1</sup>G<sub>4</sub> → <sup>3</sup>H<sub>5</sub>, <sup>1</sup>D<sub>2</sub> → <sup>1</sup>G<sub>4</sub>, and <sup>3</sup>H<sub>4</sub> → <sup>3</sup>F<sub>3</sub>, <sup>3</sup>F<sub>4</sub> in the optical telecommunication window. The significant PL emission wideband was caused by the radiative transition from Pr<sup>3+</sup>: <sup>1</sup>D<sub>2</sub> to <sup>1</sup>G<sub>4</sub>. At 445 nm excitation, these glasses exhibited emission bands that corresponded to blue/reddish orange spectral ranges in visible ranges. The prepared glass has a high lasing quality factor (Ω<sub>4</sub>/Ω<sub>6</sub> = 0.9), high optical energy (4.72 eV), and quantum efficiency = 87.3% with FWHM = 156 nm of transition emission from the <sup>1</sup>D<sub>2</sub> → <sup>1</sup>G<sub>4</sub> level. As a result, broadband near infrared optical amplifiers can be fabricated from the prepared glasses.