Next-generation light-emitting displays on skin should be soft, stretchable and bright1,2,3,4,5,6,7. Previously reported stretchable light-emitting devices were mostly based on inorganic nanomaterials, such as light-emitting capacitors, quantum dots or perovskites6,7,8,9,10,11. They either require high operating voltage or have limited stretchability and brightness, resolution or robustness under strain. On the other hand, intrinsically stretchable polymer materials hold the promise of good strain tolerance12,13. However, realizing high brightness remains a grand challenge for intrinsically stretchable light-emitting diodes. Here we report a material design strategy and fabrication processes to achieve stretchable all-polymer-based light-emitting diodes with high brightness (about 7,450 candela per square metre), current efficiency (about 5.3 candela per ampere) and stretchability (about 100 per cent strain). We fabricate stretchable all-polymer light-emitting diodes coloured red, green and blue, achieving both on-skin wireless powering and real-time displaying of pulse signals. This work signifies a considerable advancement towards high-performance stretchable displays.
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Part of this work was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS-1542152. We thank Agfa-Gevaert N.V. for providing PEDOT:PSS, Daikin Co. for providing PVDF-HFP and Kaneka Co. for providing SIBS. Y.-X.W. was supported by a visiting scholar funding (201806255002) from the China Scholarship Council. N.M. was supported by a Japan Society for the Promotion of Science (JSPS) Overseas Research Fellowship. This research used resources of the Advanced Light Source, a U.S. Department of Energy Office of Science User Facility under contract no. DE-AC02-05CH11231.
Stanford University has filed a patent application related to this work, the patent application number is 63/314,875.
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Extended data figures and tables
The films were prepared by spin coating from a mixture solution of SY (7 mg ml−1) and PU (7 mg ml−1) in THF with different weight ratios and dried under vacuum (200 mTorr) for 30 min. Distinct nanofibre structures can be seen with the addition of PU.
The scale bar is 100 μm.
Extended Data Fig. 3 Photographs of stretchable light-emitting films with different colours for various wearable applications.
a, Photographs of photoluminescent images of a stretchable and patterned light-emitting polymer film under stretching and twisting. The scale bar is 5 mm. b, Photographs of photoluminescent images of a patterned light-emitting polymer film seamlessly integrated with the finger withstanding various deformations.
Spectrum of emission/absorption ratio of SY/PU films (nearly the same thickness) with increased amount of PU: collected from spin-coated films (a) and after normalization on the basis of SY unit mass (b).
Extended Data Fig. 5 2D contour plots of time-resolved PL of SY/PU films with increased PU amount while the film thicknesses were kept nearly the same.
A higher amount of PU resulted in longer lifetime, with the lifetime increasing from 1.49, 1.71, 1.72, 1.74, 1.84 to 1.85 ns.
Extended Data Fig. 6 Electron and hole current density versus driven voltage characteristics of SY/PU films with increased PU amount while the film thicknesses were kept nearly the same.
a, Electron current density–voltage curves. The trap-limited electron transport of SY/PU films with electron-only devices (ITO/Al/SY:PU/PFN-Br:PEIE/Al). The electron current densities were 0.0008, 0.0085, 0.0119, 0.0180, 0.0476 and 0.1383 A m−2, with PU amounts of 0, 30, 40, 50, 60 and 70 wt%, respectively. b, Hole current density–voltage curves. The trap-free hole transport of SY/PU films in a set of ITO/PEDOT:PSS:Triton X/SY:PU/MoO3/Au hole-only devices. The hole current densities were 52.7, 81.0, 255.4, 532.2, 327.1 and 350.7 A m−2 when increasing the PU amount.
Extended Data Fig. 7 PLED characteristics of SY/PU films on rigid ITO glass substrates with increased PU amount while the film thicknesses were kept nearly the same with the set of ITO/PEDOT:PSS:Triton X (8 nm)/TFB (40 nm)/SY:PU (120 nm)/PFN-Br:PEIE (10 nm)/Al (60 nm).
a, Current density–voltage curves. b, Luminance–voltage curves. c, Current efficiency–voltage curves. The luminance values were 10,868, 34,743, 19,227, 15,631, 11,159 and 2,365 cd m−2 with increased PU amount, whereas the current efficiencies were 4.1, 14.2, 13.1, 13.5, 13.5 and 13.3 cd A−1.
PESA measurements of SY/PU film (a), red polymer/PU film (b), green polymer/PU film (c), blue polymer/PU film (d), PFN-Br/PEIE film (e), TFB/PU film (f), PEDOT:PSS/Triton X film (g) and PEDOT:PSS/PR film (h). UV–vis absorption spectra of SY/PU film (i), red polymer/PU film (j), green polymer/PU film (k), blue polymer/PU film (l), PFN-Br/PEIE film (m) and TFB/PU film (n). Optical bandgap was estimated from the absorption edge of as-cast thin film. HOMO energies were determined by UV PESA. LUMO energies were calculated according to ELUMO = Eg + EHOMO.
Fabrication process of an intrinsically stretchable APLED.
Energy-level alignment diagrams, current density and luminance, and current efficiency–luminance curves of intrinsically stretchable APLEDs (PVDF-HFP/PEDOT:PSS:PR/PEDOT:PSS:Triton X/TFB:PU/RGB-coloured light-emitting polymers:PU/PFN-Br:PEIE/PEDOT:PSS:PR/PVDF-HFP) with red (a–c), green (d–f) and blue (g–i) colours.
This file contains Supplementary Notes, Supplementary Figs. 1–30, Supplementary Tables 1–3, captions for Supplementary Videos 1–5 and Supplementary References.
A stretchable and multicolour light-emitting polymer film seamlessly integrated with the finger, withstanding various deformations.
A stretchable and multicolour light-emitting polymer film under stretching.
A stretchable and multicolour light-emitting polymer film under twisting.
A stretchable APLED seamlessly integrated with the skin under wireless powering at 9 V.
A stretchable APLED integrated with the skin showing real-time pulse signals.
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Zhang, Z., Wang, W., Jiang, Y. et al. High-brightness all-polymer stretchable LED with charge-trapping dilution. Nature 603, 624–630 (2022). https://doi.org/10.1038/s41586-022-04400-1
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