Figure 2|Cascading upconversion amplification for multispectral narrowband NIR photodetections. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 2|Cascading upconversion amplification for multispectral narrowband NIR photodetections.

Caption

a, Schematic illustration of the photodetector device's mechanism. b, Absorption of MAPbI3 films, Nd3+, Yb3+, Er3+, and emission spectra from 1D2?3F4, 1G4?3H6, 2H11/2, 4S3/2?4I15/2, 4F9/2?4I15/2transtions in CSS UCNCs, respectively. c, On-off switching currents of CSS/MAPbI3, Au NRs/CSS/MAPbI3, MLA/ CSS/MAPbI3, MLA/Au NRs/CSS/MAPbI3 under separately 808, 980, and 1540 nm excitation at power density of 2 mW/cm2. d, Photocurrent response of the MLA/Au NRs/CSS/MAPbI3 device under the irradiance of 650-1650 nm light.

Credit

Yanan Ji, Wen Xu, Nan Ding, Haitao Yang, Hongwei Song, Qingyun Liu, Hans Ågren, Jerker Widengren, Haichun Liu

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