Abstract
Lead halide perovskites are widely applied in not only photovoltaics but also on-chip light sources and photon detection. To promote the incorporation of perovskite into integrated devices, microscale color patterning flexibility is a very important step. Here, we demonstrate spatially resolved modulation of the fluorescence of nanoplatelets (NPs) by femtosecond direct laser writing (fs-DLW). As the perovskite NP for the fs-DLW pattern is specially designed with a gradual bromide-iodide composition along the depth, the replacement of iodide ions by bromide ions can be activated under a controlled laser pulse and fluorescence is thus modulated from red to green. The effect of processing depth and NP thickness on fluorescence modulation is systemically investigated. The as-grown thick NP (thickness ≈ 500 nm) mainly exhibits a 690 nm emission from the bottom iodine-rich phase. After halide substitution induced by fs-DLW, a new fluorescence peak appears in the wavelength range of 540-600 nm; the peak position and intensity are controlled by the DLW conditions. The fluorescent color is spatially modulated from red to green, enabling microscale-resolved multicolor emission. Compared with other currently available techniques, microscale color patterning via fs-DLW is a straightforward mask-free one-step operation, yielding high spatial resolution and enabling three-dimensional patterning by the multiple-photon method. We demonstrate that arbitrary patterns can be drawn on a wide range of perovskite NPs, implying the potential applications in microencryption, sensors, multicolor displays, lasers, and light-emitting devices.
| Original language | English |
|---|---|
| Pages (from-to) | 26017-26023 |
| Number of pages | 7 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 11 |
| Issue number | 29 |
| DOIs | |
| Publication status | Published - 24 Jul 2019 |
Keywords
- direct laser writing
- femtosecond laser fabrication
- fluorescence
- gradient band gap
- mixed-halide perovskites
Cite this
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Spatially modulating the fluorescence color of mixed-halide perovskite nanoplatelets through direct femtosecond laser writing. / Zhou, Chunhua; Cao, Guiyuan; Gan, Zhixing; Ou, Qingdong; Chen, Weijian; Bao, Qiaoliang; Jia, Baohua; Wen, Xiaoming.
In: ACS Applied Materials and Interfaces, Vol. 11, No. 29, 24.07.2019, p. 26017-26023.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Spatially modulating the fluorescence color of mixed-halide perovskite nanoplatelets through direct femtosecond laser writing
AU - Zhou, Chunhua
AU - Cao, Guiyuan
AU - Gan, Zhixing
AU - Ou, Qingdong
AU - Chen, Weijian
AU - Bao, Qiaoliang
AU - Jia, Baohua
AU - Wen, Xiaoming
PY - 2019/7/24
Y1 - 2019/7/24
N2 - Lead halide perovskites are widely applied in not only photovoltaics but also on-chip light sources and photon detection. To promote the incorporation of perovskite into integrated devices, microscale color patterning flexibility is a very important step. Here, we demonstrate spatially resolved modulation of the fluorescence of nanoplatelets (NPs) by femtosecond direct laser writing (fs-DLW). As the perovskite NP for the fs-DLW pattern is specially designed with a gradual bromide-iodide composition along the depth, the replacement of iodide ions by bromide ions can be activated under a controlled laser pulse and fluorescence is thus modulated from red to green. The effect of processing depth and NP thickness on fluorescence modulation is systemically investigated. The as-grown thick NP (thickness ≈ 500 nm) mainly exhibits a 690 nm emission from the bottom iodine-rich phase. After halide substitution induced by fs-DLW, a new fluorescence peak appears in the wavelength range of 540-600 nm; the peak position and intensity are controlled by the DLW conditions. The fluorescent color is spatially modulated from red to green, enabling microscale-resolved multicolor emission. Compared with other currently available techniques, microscale color patterning via fs-DLW is a straightforward mask-free one-step operation, yielding high spatial resolution and enabling three-dimensional patterning by the multiple-photon method. We demonstrate that arbitrary patterns can be drawn on a wide range of perovskite NPs, implying the potential applications in microencryption, sensors, multicolor displays, lasers, and light-emitting devices.
AB - Lead halide perovskites are widely applied in not only photovoltaics but also on-chip light sources and photon detection. To promote the incorporation of perovskite into integrated devices, microscale color patterning flexibility is a very important step. Here, we demonstrate spatially resolved modulation of the fluorescence of nanoplatelets (NPs) by femtosecond direct laser writing (fs-DLW). As the perovskite NP for the fs-DLW pattern is specially designed with a gradual bromide-iodide composition along the depth, the replacement of iodide ions by bromide ions can be activated under a controlled laser pulse and fluorescence is thus modulated from red to green. The effect of processing depth and NP thickness on fluorescence modulation is systemically investigated. The as-grown thick NP (thickness ≈ 500 nm) mainly exhibits a 690 nm emission from the bottom iodine-rich phase. After halide substitution induced by fs-DLW, a new fluorescence peak appears in the wavelength range of 540-600 nm; the peak position and intensity are controlled by the DLW conditions. The fluorescent color is spatially modulated from red to green, enabling microscale-resolved multicolor emission. Compared with other currently available techniques, microscale color patterning via fs-DLW is a straightforward mask-free one-step operation, yielding high spatial resolution and enabling three-dimensional patterning by the multiple-photon method. We demonstrate that arbitrary patterns can be drawn on a wide range of perovskite NPs, implying the potential applications in microencryption, sensors, multicolor displays, lasers, and light-emitting devices.
KW - direct laser writing
KW - femtosecond laser fabrication
KW - fluorescence
KW - gradient band gap
KW - mixed-halide perovskites
UR - http://www.scopus.com/inward/record.url?scp=85070485634&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b07708
DO - 10.1021/acsami.9b07708
M3 - Article
VL - 11
SP - 26017
EP - 26023
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 29
ER -