Asymmetric blue multiple resonance type themally activated delayed fluorescence (TADF) materials composed of diphenylamine combined with carbazole and acridine units were synthesized and evaluated to finetune electronic and photophysical properties....

An impulse radar‐UWB antenna for home security service application is proposed. The antenna consists of a partially elliptical monopole and a couch‐like reflector. The couch‐like reflector creates an antenna beam wide enough to be used for home security service applications. In addition, the antenna can be inconspicuously installed in the upper corner of a room. The dimension of the proposed antenna is 21 × 38 × 20 mm3. The measured H‐plane beam width is wider than 130° over the 10 dB return loss bandwidth of the antenna (6.7–10.33 GHz). The peak gain is greater than 4 dBi in the frequency band of interest. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1721–1724, 2013

In this study, we designed and synthesized two blue fluorescence materials using phenylanthracenesubstituted-indenoquinoline derivatives by Suzuki coupling reaction for organic light-emitting diodes (OLEDs). In order to study their electroluminescent properties, we fabricated the OLED devices using these two materials as emissive layer (EML) with the following sequence: indium-tin-oxide (ITO, 180 nm)/4,4′,4″-tris[2-naphthyl(phenyl)-amino]triphenylamine (2-TNATA, 30 nm)/N,N′-diphenyl-N,N′-(2-napthyl)-(1,1′-phenyl)-4,4′-diamine (NPB, 20 nm)/Blue emitting materials (20 nm)/4,7-Diphenyl-1,10-phenanthroline (Bphen, 30 nm)/lithium quinolate (Liq, 2 nm)/Al (100 nm). In particular, a device using 11,11-dimethyl-3-(10-phenylanthracen-9-yl)-11H-Indeno[1,2-b]quinoline in emitting layer showed luminous efficiency, power efficiency, and external quantum efficiency of 2.18 cd/A, 1.10 lm/W, 2.20% at 20 mA/cm2, respectively, with Commission Internationale d’Énclairage (CIE) coordinates of (0.15, 0.11) at 8.0 V.

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