CuBr blue light emitting electroluminescent thin film devices

Abstract

Visible blue cathodoluminescence (CL), photoluminescence (PL), x‐ray excited optical luminescence (XEOL) and electroluminescence (EL) via Zf free excitonic emission have been obtained from CuBr thin films deposited on glass, Cr coated glass, GaAs and Si substrates. In addition to the Zf emission several peaks corresponding to Cu+ emissions via 3d94s ↔ d10 transitions were observed on the AC EL spectrum at 2.10, 2.7, 3.03, 3.07 and 3.80 eV. X‐ray diffraction (XRD) measurements confirmed that the vacuum evaporated CuBr thin films grow preferentially with a (111) orientation irrespective of the substrate. While the AC voltage source was found to have no detrimental effects on CuBr thin films, cathodic deposition of Cu metal via electrolytic decomposition was observed under steady state DC voltage stresses. The results from the various luminescence experiments suggest that CuBr thin films may be used as a phosphor layer in blue emitting AC thin film electroluminescent devices (ACTFELD) (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Growth and luminescence properties of γ-CuBr single crystals by the Bridgman method

“…4 The peaks at 495 and 660 nm which belong to deep-level emission are related to the copper vacancies and the bromine deficiency, respectively, and often need to be suppressed because they are slow components. 16–20 The free-exciton emission intensity of γ-CuBr crystals at low temperature is much stronger than that at room temperature (the emission intensity at 77 K is about 3500 times that at room temperature). After 15 days at room temperature, the emission intensity of free excitons also decreases.…”

“…5b), which is consistent with reported data. 15,16 The PL spectra of γ-CuBr single crystals under different conditions excited by a wavelength of 425 nm are shown in Fig. 6a.…”

Climate emergency and political will—reaching beyond human usefulness

“…11 As well as being the right thing to do, it makes economic sense. 12 Green investment is a way to grow the economy. 13 If we don't invest now, reaching net zero will be more expensive in the long run.…”

Epitaxial Electrodeposition of Wide Bandgap Cuprous Bromide on Silver via a Silver Bromide Buffer Layer

“…12,13 Therefore, CuBr shows great potential for shortwavelength devices such as light-emitting devices, nonlinear optical devices, and UV photodetectors. [14][15][16][17][18] Ultrathin 2D nonlayered CuBr flakes have been used to build UV photodetectors with high photoresponsivity and fast response. 18 Additionally, CuBr has been applied as an inorganic HTM in organic photovoltaics and transistors.…”