Sb2O3/Ag/Sb2O3 Multilayer Transparent Conducting Films For Ultraviolet Organic Light-emitting Diode

Abstract

A novel UV transparent conducting films based on Sb2O3/Ag/Sb2O3 (SAS) structure, which were prepared by an electron-beam thermal evaporation at room temperature. This SAS exhibits excellent electrical, optical and stable properties. Especially for UV region, the SAS has high transmittance of 80% at 306 nm and 92% at 335 nm, meanwhile achieving low sheet resistance ( ≤ 10 Ω sq−1). The UV OLED based on the SAS show competitive device performance. The UV OLED obtains the peak of UV electroluminescence at 376 nm and shows a very high maximum EQE of 4.1% with the maximum output power density of 5.18 mW cm−2. These results indicate that the potential of SAS applications in deep UV transparent electrodes and large-scale flexible transparent electronics.

Microcavity‐Enhanced Blue Organic Light‐Emitting Diode for High‐Quality Monochromatic Light Source with Nonquarterwave Structural Design

“…Irradiance–current–voltage curves were measured using a system incorporating a powermeter (PM320E, Thorlabs) and a source‐measure unit (2611, Keithley). The method of direct measurement of EQE was performed by using a high sensitivity (5 nW to 0.5 mW), large diameter detector (S130 VC, Thorlabs, ∅9.5 mm) to measure the output power of devices, making sure the detector in contact with the active pixel as much as possible and the device under test underfilled the detector area, while monitoring the current simultaneously. The EQE was calculated by converting the power signal to emit photons and the device current to electrons.…”

Exploiting Ternary Blends to Accurately Control the Coloration of Semitransparent, Non‐Fullerene, Organic Solar Cells

“…In addition, wide bandgap acceptors (2.07 eV) T2‐ORH [ 42,43 ] and T2‐OEHRH [ 44 ] were included as ternary components, which were used to obtain a diverse range of colors. Colorized STOSCs based on these ternary blends were fabricated using semitransparent electrodes consisting of Sb 2 O 3 /Ag/Sb 2 O 3 (SAS) stacks [ 45–47 ] whose compositions were systematically formulated to achieve a range of colors, including cyan, aqua, indigo, purple, and reddish‐purple, with a champion PCE of 6.93% and an AVT of 34.03%. To the best our knowledge, this study is the first to take advantage of ternary active layer blends to achieve accurate control over the color of STOSCs.…”

Realization of Flexible Ultraviolet Organic Light‐Emitting Diodes: Key Design Issues

“…The seminal work on UV OLEDs was reported a Berggren et al, who combined the polymeric organic polymer poly(3‐(4‐octyl‐phenyl)‐2,2′‐bithiophene) (PTOPT) with 2‐(4‐Biphenylyl)‐5‐(4‐tert‐butylphenyl)‐1,3,4‐oxadiazole (PBD), a small‐molecular organic material, realizing UV OLEDs with a peak wavelength of 394 nm and 0.1% external quantum efficiency (EQE) at 15 V. [ 8 ] Various kinds of organic UV emitters were subsequently reported such as polysilane materials, [ 9,10 ] spirobifluorene materials, [ 11,12 ] heavy metal complexes, [ 13,14 ] thermally activated delayed fluorescence (TADF), [ 15 ] etc. [ 16–21 ] Recently, a few UV OLED works using thermal evaporation of a common wide‐gap electron transport layer (ETL) called 3‐(Biphenyl‐4‐yl)‐5‐(4‐tert‐butylphenyl)‐4‐phenyl‐4H‐1,2,4‐triazole (TAZ) as a UV emitter have been reported. [ 22–30 ] Efforts were focused mainly on identifying UV emitters and on improving the injection of holes into the deep highest occupied molecular orbital (HOMO) level of UV emitters (see the summary of the performance of previous UV OLEDs in Figure S1 and Table S1 in Supporting Information).…”