Top-Emitting Microcavity Light-Emitting Diodes Based on All-Thermally Evaporated Lead-Free Copper Halide Self-Trapped-Exciton Emitters

Abstract

The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpclett.2c00740.Experimental materials, fabrications, characterizations, and supplementary figures and tables (PDF)

Self-trapped excitons in soft semiconductors

“…8G). 189 As can be ascertained from Fig. 8H, the maximum EQE of the top-emitting microcavity device can reach the value of 2.12%.…”

“…To date, the STE-related nanostructures have emerged as a highly promising class of light-emitting materials due to their broadband emission properties from STEs. 135,182,[186][187][188][189][190] The broadband sub-band emission PL spectra of the STE-related materials with large Stokes shifts, high quantum efficiency, and tunable center wavelength render them among of the most promising candidates for the development of highefficiency LEDs with desirable light wavelengths. The development of LEDs from STE-related materials has drawn wide attention due to the high PLQE and feasible color tunability.…”

“…By fabricating the ternary CsCu 2 I 3 perovskite, Ma et al demonstrated a yellow LED with a maximum luminance of 47.5 cd m −2 and an external quantum efficiency of 0.17%. 39 Although the intrinsic broadband spectral emissions from STEs permit the realization of white LED (WLED) with a single 189 emitter, 140,195,196 the recorded performances are far from commercial application. However, it was recently reported that the excellent properties of STE-related materials can be used for the development of LEDs with superior performance, in terms of high EQE, high color rendering index, robust stability, and tunable color emission center.…”

Tailoring the 2D/3D Phase Segregation for Highly Efficient Si-Based Perovskite Light-Emitting Diodes

“…When the perovskite emissive layer is sandwiched between the metal anode and the cathode, a Fabry−Perot resonator is formed. 24,25 The resonant wavelengths of the cavity are determined by the comprehensive influence of the phaseshift at bottom and top contacts and the total optical thicknesses of the layers between two reflective mirrors. To meet the resonant condition, the wavelength has to comply with the following equation:…”

“…When the perovskite emissive layer is sandwiched between the metal anode and the cathode, a Fabry–Perot resonator is formed. , The resonant wavelengths of the cavity are determined by the comprehensive influence of the phase-shift at bottom and top contacts and the total optical thicknesses of the layers between two reflective mirrors. To meet the resonant condition, the wavelength has to comply with the following equation: where λ is the resonant wavelength of the cavity; n i and d i are the refractive index and thickness of the i th layer between anode and cathode, respectively; θ i is the light propagation direction in the i th layer; and Φ 1 and Φ 2 are the phase shifts at bottom electrodes and top electrodes, respectively.…”