Direct Laser Patterning of Stable All-Inorganic Perovskite Nanocrystals for Stimuli-Responsive Multimodal Fluorescent Anticounterfeiting Devices and Information Security Latika Juneja, Garima Choudhary, P.K. Giri, Saikat Bhaumik Advanced Optical Materials, 2026 Recently, metal halide perovskite materials have shown remarkable progress in next‐generation LEDs, anticounterfeiting, and imaging applications. However, achieving uniform, high‐quality micron‐sized perovskite fluorescent patterns remains a critical challenge, since they are prone to degrade in photoresist (PR), polar solvents, and intense laser irradiation. There are a few research articles on perovskite bulk films, but patterning of perovskite nanocrystals (PNCs) and their application have not been extensively explored. In this regard, we synthesized double‐coated CsPbX 3 (X = Br, I) PNCs via a ligand‐assisted reprecipitation method and studied photophysical properties. We introduce rapid emission recovery of thermally quenched PNC films via 2‐Methylimidazole treatment. We fabricated flexible, hard‐to‐replicate PNC patterns using continuous‐wave direct laser patterning (DLP) technology. We developed ∼10 µm‐size green‐emitting arrays from the mixture of SU8 PR and CsPbBr 3 PNCs, which exhibited multimodal anticounterfeiting properties. However, the non‐uniform luminescent arrays and chemical instability of red‐emitting CsPbI 3 PNCs within SU8 limit their applications. We present a PR‐free DLP process that enables patterning of PNC films with dimensions of ∼40 µm. We also introduce a 4D “stimuli‐responsive binary information cycle” using CsPbI 3 PNCs, involving UV excitation, microscope resolution, thermal erasure, and chemical recovery. These results establish a versatile platform for practical, stimuli‐responsive anticounterfeiting applications.
Highly Luminescent Zn2+-Doped CsPb (Cl/Br) 3 Nanocrystals: Flexible Microfibers for Applications in Down-converted Blue LEDs and Temperature Sensing K Sahoo, P Kashyap, S Supriya, S Bhaumik, R Naik Materials Research Bulletin, 114217 , 2026 2026
Direct Laser Patterning of Stable All‐Inorganic Perovskite Nanocrystals for Stimuli‐Responsive Multimodal Fluorescent Anticounterfeiting Devices and Information Security L Juneja, G Choudhary, PK Giri, S Bhaumik Advanced Optical Materials 14 (15), e71188 , 2026 2026
Luminescent metal halide perovskite nanomaterials for lighting and imaging applications S Bhaumik Proceedings of Emerging Light Emitting Materials 2025 (EMLEM25) , 2025 2025
Ultrasensitive temperature sensing based on color tunable CsPbX3@ MOF nanocomposites and their electrospun microfibers for down-converted WLED application S Ray, A Mohapatra, P Kashyap, S Bhaumik Journal of Alloys and Compounds 1015, 178867 , 2025 2025 Citations: 8
Double-encapsulated red-emitting formamidinium lead halide perovskite nanocrystals for fluorescence sensing and lighting applications K Sahoo, L Juneja, R Naik, S Bhaumik Nanoscale Advances 7 (17), 5411-5420 , 2025 2025 Citations: 6
Nonlinear optical properties of stable Cs-doped FAPbBr 3 core@ shell layered perovskite nanocrystals: superior temperature sensing and flexible fiber-based pure green LEDs A Mohapatra, S Ray, PC Kumar, RK Das, P Kashyap, S Bhaumik Nanoscale 17 (19), 12416-12431 , 2025 2025 Citations: 8
Perovskite-Based Light-Emitting Diodes A Mohapatra, S Bhaumik Perovskite Optoelectronic Devices, 365-396 , 2024 2024
Highly stable fluorescent CsPbBr3 perovskite nanocrystals with reduced in-vitro toxicity for bioimaging and mercury ion detection in cells A Mohapatra, S Kumar, TK Acharya, C Goswami, S Bhaumik Materials Today Chemistry 36, 101930 , 2024 2024 Citations: 24
Precipitation-assisted, low-temperature-annealed TiO 2 and its nanocomposites-based photoanode for DSSCs A Dutta, M Nayak, R Nag, A Bera, S Bhaumik, AJ Akhtar, SK Saha Journal of Materials Science: Materials in Electronics 35 (4), 292 , 2024 2024 Citations: 11
Highly stable and luminescent formamidinium-based perovskite nanocrystal probe for temperature and mercury sensors and in vitro imaging in live cells K Sahoo, S Kumar, A Mohapatra, NK Dubey, R Naik, C Goswami, ... Journal of Materials Chemistry C 12 (42), 17315-17327 , 2024 2024 Citations: 16
Highly stable multi-encapsulated red-emitting cesium lead halide nanocrystals for efficient copper ion detection and imaging in live cells A Mohapatra, S Kumar, TK Acharya, C Goswami, S Bhaumik Journal of Alloys and Compounds 947, 169453 , 2023 2023 Citations: 18
High-frequency pulsed-electroluminescence from light-emitting diodes based on quasi-2D perovskites (rubidium-doped CsPbBr3) R Chakraborty, S Bhaumik, AJ Pal Materials Science and Engineering: B 289, 116247 , 2023 2023 Citations: 3
Understanding the charge transfer mechanism in CsPbBr 3 nanocrystals and nitrogen-doped carbon quantum dot heterostructures: effect of nanocrystal encapsulation S Ray, MR Sahoo, S Mukherjee, A Perumal, SK Nayak, S Bhaumik RSC advances 13 (50), 35551-35561 , 2023 2023 Citations: 10
Stable and luminescent cesium copper halide nanocrystals embedded in flexible polymer fibers for fabrication of down-converting WLEDs MR Kar, K Sahoo, A Mohapatra, S Bhaumik Nanoscale Advances 5 (22), 6238-6248 , 2023 2023 Citations: 11
Highly water-stable, luminescent, and monodisperse polymer-coated CsPbBr 3 nanocrystals for imaging in living cells with better sensitivity MR Kar, S Kumar, TK Acharya, C Goswami, S Bhaumik RSC advances 13 (9), 5946-5956 , 2023 2023 Citations: 15
Suppression of halide migration and improved stability in double-coated cesium lead halide perovskite nanocrystals for application in down-conversion white-light-emitting diodes A Mohapatra, MR Kar, S Bhaumik Journal of Alloys and Compounds 927, 166972 , 2022 2022 Citations: 25
Recent progress and prospects on metal halide perovskite nanocrystals as color converters in the fabrication of white light-emitting diodes A Mohapatra, MR Kar, S Bhaumik Frontiers in Electronic Materials 2, 891983 , 2022 2022 Citations: 16
Impact of Zn-doping on the composition, stability, luminescence properties of silica coated all-inorganic cesium lead bromide nanocrystals and their biocompatibility MR Kar, R Chakraborty, U Patel, S Ray, TK Acharya, C Goswami, ... Materials Today Chemistry 23, 100753 , 2022 2022 Citations: 36
Highly stable and water dispersible polymer-coated CsPbBr 3 nanocrystals for Cu-ion detection in water MR Kar, U Patel, S Bhaumik Materials Advances 3 (23), 8629-8638 , 2022 2022 Citations: 24
Synthesis of highly stable double-coated Zn-doped cesium lead bromide nanocrystals for indium ion detection in water S Ray, A Mohapatra, S Bhaumik Materials Advances 3 (11), 4684-4692 , 2022 2022 Citations: 17
MOST CITED SCHOLAR PUBLICATIONS
Inorganic halide perovskites for efficient light-emitting diodes N Yantara, S Bhaumik, F Yan, D Sabba, HA Dewi, N Mathews, PP Boix, ... The journal of physical chemistry letters 6 (21), 4360-4364 , 2015 2015 Citations: 616
Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals M Li, S Bhaumik, TW Goh, MS Kumar, N Yantara, M Grätzel, S Mhaisalkar, ... Nature communications 8 (1), 14350 , 2017 2017 Citations: 505
Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals W Chen, S Bhaumik, SA Veldhuis, G Xing, Q Xu, M Grätzel, S Mhaisalkar, ... Nature communications 8 (1), 15198 , 2017 2017 Citations: 265
Highly stable, luminescent core–shell type methylammonium–octylammonium lead bromide layered perovskite nanoparticles S Bhaumik, SA Veldhuis, YF Ng, M Li, SK Muduli, TC Sum, B Damodaran, ... Chemical communications 52 (44), 7118-7121 , 2016 2016 Citations: 190
Benzyl Alcohol-Treated CH 3 NH 3 PbBr 3 Nanocrystals Exhibiting High Luminescence, Stability, and Ultralow Amplified Spontaneous Emission Thresholds SA Veldhuis, YKE Tay, A Bruno, SSH Dintakurti, S Bhaumik, SK Muduli, ... Nano Letters 17 (12), 7424-7432 , 2017 2017 Citations: 129
Recent advances of lead-free metal halide perovskite single crystals and nanocrystals: synthesis, crystal structure, optical properties, and their diverse applications S Bhaumik, S Ray, SK Batabyal Materials today chemistry 18, 100363 , 2020 2020 Citations: 84
State of the art and prospects of metal halide perovskite core@ shell nanocrystals and nanocomposites MR Kar, S Ray, BK Patra, S Bhaumik Materials Today Chemistry 20, 100424 , 2021 2021 Citations: 54
Mn-doped nanocrystals in light-emitting diodes: Energy-transfer to obtain electroluminescence from quantum dots AK Rath, S Bhaumik, AJ Pal Applied Physics Letters 97 (11) , 2010 2010 Citations: 52
Broadband emission from zero-dimensional Cs 4 PbI 6 perovskite nanocrystals S Bhaumik, A Bruno, S Mhaisalkar RSC advances 10 (23), 13431-13436 , 2020 2020 Citations: 44
Light-emitting diodes based on solution-processed nontoxic quantum dots: oxides as carrier-transport layers and introducing molybdenum oxide nanoparticles as a hole-inject layer S Bhaumik, AJ Pal ACS applied materials & interfaces 6 (14), 11348-11356 , 2014 2014 Citations: 41
Impact of Zn-doping on the composition, stability, luminescence properties of silica coated all-inorganic cesium lead bromide nanocrystals and their biocompatibility MR Kar, R Chakraborty, U Patel, S Ray, TK Acharya, C Goswami, ... Materials Today Chemistry 23, 100753 , 2022 2022 Citations: 36
Color tunable light-emitting diodes based on copper doped semiconducting nanocrystals S Bhaumik, B Ghosh, AJ Pal Applied Physics Letters 99 (8) , 2011 2011 Citations: 29
Solution-processed reduced graphene oxide in light-emitting diodes and photovoltaic devices with the same pair of active materials SK Saha, S Bhaumik, T Maji, TK Mandal, AJ Pal RSC advances 4 (67), 35493-35499 , 2014 2014 Citations: 26
Suppression of halide migration and improved stability in double-coated cesium lead halide perovskite nanocrystals for application in down-conversion white-light-emitting diodes A Mohapatra, MR Kar, S Bhaumik Journal of Alloys and Compounds 927, 166972 , 2022 2022 Citations: 25
Highly stable fluorescent CsPbBr3 perovskite nanocrystals with reduced in-vitro toxicity for bioimaging and mercury ion detection in cells A Mohapatra, S Kumar, TK Acharya, C Goswami, S Bhaumik Materials Today Chemistry 36, 101930 , 2024 2024 Citations: 24
Highly stable and water dispersible polymer-coated CsPbBr 3 nanocrystals for Cu-ion detection in water MR Kar, U Patel, S Bhaumik Materials Advances 3 (23), 8629-8638 , 2022 2022 Citations: 24
Vacuum‐Processed Metal Halide Perovskite Light‐Emitting Diodes: Prospects and Challenges S Bhaumik, MR Kar, BN Thorat, A Bruno, SG Mhaisalkar ChemPlusChem 86 (4), 558-573 , 2021 2021 Citations: 22
All-inorganic light-emitting diodes based on solution-processed nontoxic and earth-abundant nanocrystals S Bhaumik, AJ Pal IEEE Journal of Quantum Electronics 49 (3), 325-330 , 2013 2013 Citations: 20
Highly stable multi-encapsulated red-emitting cesium lead halide nanocrystals for efficient copper ion detection and imaging in live cells A Mohapatra, S Kumar, TK Acharya, C Goswami, S Bhaumik Journal of Alloys and Compounds 947, 169453 , 2023 2023 Citations: 18