Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots
In this paper, we studied nonlinear absorption of infrared (IR) (1250 nm) femtosecond pulses and visible photoluminescence (PL) excited by them in liquid-crystal (LC) polymer films with embedded CdSe/ZnS core-shell type quantum dots (QDs). The dependence of nonlinear transmission on incident intens...
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| Format: | Article |
| Language: | English |
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Herzen State Pedagogical University of Russia
2024-03-01
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| Series: | Physics of Complex Systems |
| Subjects: | |
| Online Access: | https://physcomsys.ru/index.php/physcomsys/article/view/167 |
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| author | Вячеслав Юрьевич Нестеров Никита Денисович Преснов Станислав Васильевич Заботнов Алексей Сократович Мерекалов Олег Николаевич Карпов Георгий Александрович Шандрюк Раиса Викторовна Тальрозе Леонид Анатольевич Головань |
| author_facet | Вячеслав Юрьевич Нестеров Никита Денисович Преснов Станислав Васильевич Заботнов Алексей Сократович Мерекалов Олег Николаевич Карпов Георгий Александрович Шандрюк Раиса Викторовна Тальрозе Леонид Анатольевич Головань |
| author_sort | Вячеслав Юрьевич Нестеров |
| collection | DOAJ |
| description |
In this paper, we studied nonlinear absorption of infrared (IR) (1250 nm) femtosecond pulses and visible photoluminescence (PL) excited by them in liquid-crystal (LC) polymer films with embedded CdSe/ZnS core-shell type quantum dots (QDs). The dependence of nonlinear transmission on incident intensity indicated three-photon absorption in the films, with the three-photon absorption coefficient for the QD-LC polymer composite comparable with the one for bulk CdSe. The spectrum of PL excited by IR pulses coincides with one-photon excited PL spectrum. Dependence of the PL signal on the IR laser radiation power is cubic with further saturation for the spectral region from 2.10 to 2.25 eV, with saturation intensity decreasing with lower PL photon energy. The presence of the second-harmonic signal in the up-conversion spectrum results in its variation with an excitation power increase.
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| first_indexed | 2024-04-24T11:55:24Z |
| format | Article |
| id | doaj.art-58af796f807145248a4e33040ce0e287 |
| institution | Directory Open Access Journal |
| issn | 2687-153X |
| language | English |
| last_indexed | 2024-04-24T11:55:24Z |
| publishDate | 2024-03-01 |
| publisher | Herzen State Pedagogical University of Russia |
| record_format | Article |
| series | Physics of Complex Systems |
| spelling | doaj.art-58af796f807145248a4e33040ce0e2872024-04-09T05:04:20ZengHerzen State Pedagogical University of RussiaPhysics of Complex Systems2687-153X2024-03-015110.33910/2687-153X-2024-5-1-3-9Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dotsВячеслав Юрьевич Нестеров0Никита Денисович Преснов1Станислав Васильевич Заботнов2Алексей Сократович Мерекалов3Олег Николаевич Карпов4Георгий Александрович Шандрюк5Раиса Викторовна Тальрозе6Леонид Анатольевич Головань7Lomonosov Moscow State University; Moscow Institute of Physics and TechnologyLomonosov Moscow State UniversityLomonosov Moscow State UniversityA. V. Topchiev Institute of Petrochemical SynthesisLomonosov Moscow State University; A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of SciencesLomonosov Moscow State University; A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of SciencesLomonosov Moscow State University; A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of SciencesLomonosov Moscow State University In this paper, we studied nonlinear absorption of infrared (IR) (1250 nm) femtosecond pulses and visible photoluminescence (PL) excited by them in liquid-crystal (LC) polymer films with embedded CdSe/ZnS core-shell type quantum dots (QDs). The dependence of nonlinear transmission on incident intensity indicated three-photon absorption in the films, with the three-photon absorption coefficient for the QD-LC polymer composite comparable with the one for bulk CdSe. The spectrum of PL excited by IR pulses coincides with one-photon excited PL spectrum. Dependence of the PL signal on the IR laser radiation power is cubic with further saturation for the spectral region from 2.10 to 2.25 eV, with saturation intensity decreasing with lower PL photon energy. The presence of the second-harmonic signal in the up-conversion spectrum results in its variation with an excitation power increase. https://physcomsys.ru/index.php/physcomsys/article/view/167semiconductor quantum dotsliquid-crystal polymerup-conversionphotoluminescencemultiphoton absorption |
| spellingShingle | Вячеслав Юрьевич Нестеров Никита Денисович Преснов Станислав Васильевич Заботнов Алексей Сократович Мерекалов Олег Николаевич Карпов Георгий Александрович Шандрюк Раиса Викторовна Тальрозе Леонид Анатольевич Головань Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots Physics of Complex Systems semiconductor quantum dots liquid-crystal polymer up-conversion photoluminescence multiphoton absorption |
| title | Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots |
| title_full | Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots |
| title_fullStr | Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots |
| title_full_unstemmed | Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots |
| title_short | Three-photon absorption and photoluminescence in films of liquid-crystal polymers with embedded CdSe/ZnS quantum dots |
| title_sort | three photon absorption and photoluminescence in films of liquid crystal polymers with embedded cdse zns quantum dots |
| topic | semiconductor quantum dots liquid-crystal polymer up-conversion photoluminescence multiphoton absorption |
| url | https://physcomsys.ru/index.php/physcomsys/article/view/167 |
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