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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2510.15184 |
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| author | Narayanan, Pournima Hamid, Rabeeya Pucurimay, Linda Lecina, Ona Segura Carwithen, Ben P. Schopp, Jacob Edwards, Justin S. Adeyeye, Oluwaseun Noah Feng, Demeng Hait, Diptarka Martinez, Todd J. Schmidt, Timothy W. Nielsen, Michael P. Tayebjee, Murad J. Y. Kats, Mikhail A. Congreve, Daniel N. |
| author_facet | Narayanan, Pournima Hamid, Rabeeya Pucurimay, Linda Lecina, Ona Segura Carwithen, Ben P. Schopp, Jacob Edwards, Justin S. Adeyeye, Oluwaseun Noah Feng, Demeng Hait, Diptarka Martinez, Todd J. Schmidt, Timothy W. Nielsen, Michael P. Tayebjee, Murad J. Y. Kats, Mikhail A. Congreve, Daniel N. |
| contents | Upconversion of low-energy photons to higher-energy photons provides an opportunity to surpass traditional limitations in fields such as 3D printing, photovoltaics, and photocatalysis. Triplet--triplet annihilation upconversion (TTA-UC) is particularly appealing for such applications as it can efficiently upconvert low-intensity, incoherent light. However, previously demonstrated thin-film TTA systems are simultaneously constrained by modest efficiencies and limited reach into the near infrared (NIR). Here, we design a single-layer thin-film bulk heterojunction that integrates PbS quantum dots (QDs) as tunable NIR absorbers within an organic semiconductor matrix of TES-ADT, achieving large anti-Stokes shifts up to 500 nm and high internal quantum efficiencies across the NIR-I and NIR-II windows (800-1200 nm). Through the incorporation of 5-tetracene carboxylic acid ligands on the PbS QD surface, the yield of sensitized triplets was boosted, as confirmed by transient absorption and time-resolved photoluminescence measurements. The resulting films demonstrated a 15-fold improvement in UC efficiency. Furthermore, we demonstrate visible imaging of incoherent 1200 nm light via thin-film TTA-UC at incident intensities at the imaging mask as low as 20 mWcm$^2$, marking a significant advance toward practical implementation of solid-state NIR-to-visible upconversion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15184 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Visible Imaging of Incoherent 1200-nm Light via Triplet--Triplet Annihilation Upconversion Narayanan, Pournima Hamid, Rabeeya Pucurimay, Linda Lecina, Ona Segura Carwithen, Ben P. Schopp, Jacob Edwards, Justin S. Adeyeye, Oluwaseun Noah Feng, Demeng Hait, Diptarka Martinez, Todd J. Schmidt, Timothy W. Nielsen, Michael P. Tayebjee, Murad J. Y. Kats, Mikhail A. Congreve, Daniel N. Optics Materials Science Upconversion of low-energy photons to higher-energy photons provides an opportunity to surpass traditional limitations in fields such as 3D printing, photovoltaics, and photocatalysis. Triplet--triplet annihilation upconversion (TTA-UC) is particularly appealing for such applications as it can efficiently upconvert low-intensity, incoherent light. However, previously demonstrated thin-film TTA systems are simultaneously constrained by modest efficiencies and limited reach into the near infrared (NIR). Here, we design a single-layer thin-film bulk heterojunction that integrates PbS quantum dots (QDs) as tunable NIR absorbers within an organic semiconductor matrix of TES-ADT, achieving large anti-Stokes shifts up to 500 nm and high internal quantum efficiencies across the NIR-I and NIR-II windows (800-1200 nm). Through the incorporation of 5-tetracene carboxylic acid ligands on the PbS QD surface, the yield of sensitized triplets was boosted, as confirmed by transient absorption and time-resolved photoluminescence measurements. The resulting films demonstrated a 15-fold improvement in UC efficiency. Furthermore, we demonstrate visible imaging of incoherent 1200 nm light via thin-film TTA-UC at incident intensities at the imaging mask as low as 20 mWcm$^2$, marking a significant advance toward practical implementation of solid-state NIR-to-visible upconversion. |
| title | Visible Imaging of Incoherent 1200-nm Light via Triplet--Triplet Annihilation Upconversion |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2510.15184 |