We investigated the near-band-edge optical responses and photocarrier dynamics of encapsulated long-term stable CH 3 NH 3 SnI 3 (MASnI 3 ) thin films and solar-cell devices. The MASnI 3 thin film prepared with SnF 2 exhibited a bandgap of 1.25 eV, while the film without SnF 2 had a significantly blueshifted absorption edge. On the contrary, the PL peak energies were not influenced by the addition of SnF 2 . These observations indicate that the blueshift of the absorption edge in the SnF 2 -free MASnI 3 sample is due to the Burstein−Moss shift induced by a significant unintentional hole doping. Furthermore, timeresolved photoluminescence measurements revealed that by adding SnF 2 the photocarrier lifetime of the film increased by one order of magnitude, which enables improved device performance of solar cells. We clarified that in the MASnI 3 solar cells the short-circuit current stays significantly below the ideal value due to a large nonradiative recombination rate in the perovskite layer, resulting in a small photocarrier-injection efficiency into the charge-transport layers.
We developed a full‐color Organic Light Emitting Diode (OLED) display on a plastic substrate. The display area is a 3‐ inch diagonal area with 160 × RGB × 120 pixels. Silicon oxynitride (SiON) was used as a moisture barrier film on the substrate and silicon nitride (SiN) as a passivation film on the device. The display was approximately 0.2 mm thick, weighted approximately 3 g, and it was bendable.
Abstract— A full‐color 5.2‐inch 1/4‐VGA passive‐matrix organic LED display has been developed, adopting selective deposition for the different emitting materials. The display features 320 (×3) × 240 pixels with an equivalent pixel size of 0.33 × 0.33 mm, white peak luminance of over 150 cd/m2, and power consumption of 6 W.
A full color 5.2 inch 1/4VGA passive‐matrix organic LED display has been developed adopting selective deposition for the different emitting materials. The display features 320 (× 3) × 240 pixels with an equivalent pixel size of 0.33 × 0.33 mm2 white peak luminance of over 150 cd/m2 and power consumption of 6 W.
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