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. 2018 Jan;4(1):1700285.
doi: 10.1002/aelm.201700285. Epub 2017 Dec 5.

Fine-Tuned Multilayered Transparent Electrode for Highly Transparent Perovskite Light-Emitting Devices

Hua Wu  1 , Yu Zhang  2 , Xiaoyu Zhang  1 , Min Lu  1 , Chun Sun  1 , Xue Bai  1 , Tieqiang Zhang  3 , Guang Sun  4 , William W Yu  5
Affiliations

Fine-Tuned Multilayered Transparent Electrode for Highly Transparent Perovskite Light-Emitting Devices

Hua Wu et al. Adv Electron Mater. 2018 Jan.

Abstract

The high photoluminescence quantum yield, wide color tunability and narrow bandwidth of perovskite nanocrystals make them favorable for light source and display applications. Here, highly transparent green-light-emitting devices (LEDs) using inorganic cesium lead halide perovskite nanocrystal films as the emissive layer are reported. The effect of multilayered nanostructured transparent electrode on optical properties and performance within the LEDs is investigated by fine tuning layer thickness. The results show that the light transmission in visible region can be enhanced with this nanostructured film. These LEDs exhibited a high transmittance (average 73% over 400-700 nm) and high brightness of 2640 and 1572 cd m-2 for indium-doped tin oxide (ITO) cathode and MoO x /Au/MoO x anode sides, respectively.

Keywords: capping layer; charge injection; light-emitting device; perovskite nanocrystal; transparent.

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Conflict of interest statement

Conflict of Interest The authors declare no conflict of interest.

Figures

Figure 1.
Figure 1.
a) The absorption and PL spectra of CsPbBr3 NC solution, with an inset showing the photograph of the NC solutions under 365 nm irradiation; b) XRD pattern of the CsPbBr3 NC powder; and c) TEM image of CsPbBr3 NCs.
Figure 2.
Figure 2.
a) Device energy band diagram of the CsPbBr3 NC-LED. b) The UV–vis absorption spectrum of ZnO NCs, with a TEM image.
Figure 3.
Figure 3.
Comparison of a) current density–voltage (J–V) and b) luminance–voltage (L–V) characteristics of CsPbBr3 NC-LED as a function of MoOx layer thickness. c) External quantum efficiency and d) current efficiency versus current density characteristics of CsPbBr3 NC-LED as a function of MoOx layer thickness.
Figure 4.
Figure 4.
a) Visible transmittance spectra of transparent electrode without any capping layers and with different thicknesses of the MoOx capping layer; b) Transmittance spectra of the three samples with the structure of ITO, MAM, and the whole device, plus a photograph of the transparent LED.
Figure 5.
Figure 5.
a) Current density–voltage (J–V) and b) luminance–voltage (L–V) characteristics of the transparent LED; c) current efficiency and d) external quantum efficiency versus current density characteristics of the LED; EL spectra of the LED for bottom side e) and top side f) with emission angles varying from 0° to 75°.
Figure 6.
Figure 6.
a) EL spectra of the transparent device for both bottom and top sides and a photograph of a working LED at 7 V; b) CIE coordinates of the EL spectra for both bottom and top sides; and c) variations of EL intensity as a function of emission angles.
See this image and copyright information in PMC

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