Figure 2.

Device structure and performances of CP-LEDs based on pure Cu₂Au₂(R/S-BTT)₄. (a) TEM image and (b) corresponding EDS of the cross-sectional CP-LED device based on Cu₂Au₂(R-BTT)₄. (c) Energy band alignment of the CP-LED device. (d) Luminance–voltage–current density curves and (e) EQE, CE, and PE versus luminance curves of the CP-LED devices based on Cu₂Au₂(R/S-BTT)₄. (f) EL spectra of the CP-LED devices based on Cu₂Au₂(R-BTT)₄ with increased driving voltage and photograph of the operational device (inset).