Tuning the florescence color of gradient bandgap perovskite nanoplate by direct laser writing

Chunhua Zhou, Guiyuan Cao, Zhixing Gan, Qingdong Ou, Qiaoliang Bao, Baohua Jia, Xiaoming Wen

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Lead halide perovskites are widely applied in not only photovoltaics, but also on-chip light source, nanolaser, and photon detection. In order to promote the incorporation of perovskite into integrated devices, microscale color patterning flexibility is a very important step. Femtosecond (fs) laser fabrication has shown significant advantages of high spatial resolution, low surround damage, and high processing efficiency over the other laser fabrication. Compared to the state-of-art techniques, the straightforward fs-direct laser writing (fs-DLW) also has advantages of mask-free, simple one step, and contactless. Here, a specially designed formamidinium lead mixed-halide nanoplatelet (FAPb(BrxI1-x)3 NP) with gradient bandgap is fabricated by chemical vapor deposition method. Then, spatially resolved modulation of the fluorescence by fs-DLW is demonstrated on the as-grown NP. The fluorescence color is modulated from red to green under a controlled laser pulse, due to the replacement of iodide ions by bromide ions. Specifically, the as-grown NP (thickness800 nm) is with a gradual bromide-iodide composition along the depth, mainly exhibits an emission of 710-nm from the bottom iodine rich phase. After halide substitution induced by fs-DLW, new fluorescence peaks appear in the wavelength range of 540 to 700 nm, which is controlled by the fs-DLW conditions. The fluorescent color is spatially modulated from red to green, enabling microscale resolved multicolor emission, implying the potential applications in micro-encryption, sensors, multicolor displays, lasers, and light-emitting devices.

Original languageEnglish
Title of host publicationSPIE Micro + Nano Materials, Devices, and Applications 2019
EditorsM. Cather Simpson, Saulius Juodkazis
Number of pages4
ISBN (Electronic)9781510631427
Publication statusPublished - 2019
EventSPIE Micro + Nano Materials, Devices, and Applications 2019 - Melbourne, Australia
Duration: 9 Dec 201912 Dec 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Micro + Nano Materials, Devices, and Applications 2019


  • Direct laser writing
  • Florescence color tuning
  • Halide substitution
  • Mixed-halide perovskite

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