TY - JOUR

T1 - Hybrid Photonic Structures: Gallium Phosphide Nanowires Decorated with Carbon Dots for Enhanced Broadband Emission

AU - Zakharov, Viktor V.

AU - Rider, Maxim A.

AU - Kovova, Mariia S.

AU - Kuznetsov, Alexey

AU - Anikina, Maria A.

AU - Efimova, Arina A.

AU - Kondratev, Valeriy M.

AU - Shmakov, Stanislav V.

AU - Kirilenko, Demid A.

AU - Parfenov, Petеr S.

AU - Fedorov, Vladimir V.

AU - Orlova, Anna O.

AU - Bolshakov, Alexey D.

PY - 2024/7/25

Y1 - 2024/7/25

N2 - Carbon dots (CDs) are promising nanostructures in the field of photonics owing to the ease of fabrication, tunable and efficient emission. Gallium phosphide (GaP) nanowires are known for high surface area, optical density, waveguiding, resonant optical properties but lacking the luminescence due to the indirect bandgap. Here, hybrid photonic structures – GaP nanowires decorated with the CDs are fabricated and studied. Feasible drop-casting deposition technique allows fabrication of dense vertical structures exhibiting efficient photoluminescence. Deposition of the CDs over the nanowires does not affect their luminescent properties demonstrating tolerance of the approach toward the surface aggregation. Tuning of the emission spectrum is obtained via variation of the excitation wavelength and CDs’ synthesis protocol. The structures emitting throughout the visible range are obtained. Analysis of the photoluminescence of an individual structure demonstrates the most intense and fast recombination processes at the ends of a nanowire. It is shown that the luminescence of the CDs’ covering a nanowire acting as a Fabry–Perot cavity is enhanced up to a factor of 3 governed by the Purcell effect. The obtained results unveil a path for fabrication of novel photonic devices via decoration of optically dense nanowires with CDs for enhanced and directed broadband emission.

AB - Carbon dots (CDs) are promising nanostructures in the field of photonics owing to the ease of fabrication, tunable and efficient emission. Gallium phosphide (GaP) nanowires are known for high surface area, optical density, waveguiding, resonant optical properties but lacking the luminescence due to the indirect bandgap. Here, hybrid photonic structures – GaP nanowires decorated with the CDs are fabricated and studied. Feasible drop-casting deposition technique allows fabrication of dense vertical structures exhibiting efficient photoluminescence. Deposition of the CDs over the nanowires does not affect their luminescent properties demonstrating tolerance of the approach toward the surface aggregation. Tuning of the emission spectrum is obtained via variation of the excitation wavelength and CDs’ synthesis protocol. The structures emitting throughout the visible range are obtained. Analysis of the photoluminescence of an individual structure demonstrates the most intense and fast recombination processes at the ends of a nanowire. It is shown that the luminescence of the CDs’ covering a nanowire acting as a Fabry–Perot cavity is enhanced up to a factor of 3 governed by the Purcell effect. The obtained results unveil a path for fabrication of novel photonic devices via decoration of optically dense nanowires with CDs for enhanced and directed broadband emission.

KW - carbon dots

KW - gallium phosphide

KW - nanophotonics

KW - nanowires;purcell effect

UR - https://www.mendeley.com/catalogue/9b54a72d-3415-358e-8961-347ef8ad3990/

U2 - 10.1002/adom.202303198

DO - 10.1002/adom.202303198

M3 - Article

VL - 12

JO - Advanced Optical Materials

JF - Advanced Optical Materials

SN - 2195-1071

IS - 21

M1 - 2303198

ER -