Polyaniline nano-composites with large negative dielectric permittivity

Chia-Hung Hsieh, An-Hung Lee, Cheng-Dar Liu, Jin-Lin Han, Kuo-Huang Hsieh, and Sung-Nung Lee

The authors developed some innovative methods to prepare two types of polyaniline (PANI) nano-composite materials with huge negative dielectric permittivity. The first type of material is a PANI-DBSA (Dodecylbenzene sulfonic acid)/PAA(Polyacrylic acid) system synthesized by a reversed micelle method, and the second one is a PANI-DBSA/epoxy system prepared by an absorption-transferring process.

AIP Advances 2, 012127 (2012)

Metal-assisted electroless fabrication of nanoporous p-GaN for increasing the light extraction efficiency of light emitting diodes

Ruijun Wang, Duo Liu, Zhiyuan Zuo, Qian Yu, Zhaobin Feng, and Xiangang Xu

The authors report metal-assisted electroless fabrication of nanoporous p-GaN to improve the light extraction efficiency of GaN-based light emitting diodes (LEDs). They further show that the roughened GaN/air interface enables strong scattering of photons emitted from the multiple quantum wells (MQWs).

AIP Advances 2, 012109 (2012)

Enhanced life time and suppressed efficiency roll-off in phosphorescent organic light-emitting diodes with multiple quantum well structures

Ja-Ryong Koo, Seok Jae Lee, Gun Woo Hyung, Dong Whan Im, Han Sung Yu, Jung-Hwan Park, Kum Hee Lee, Seung Soo Yoon, Woo Young Kim, and Young Kwan Kim

The authors demonstrate red phosphorescent organic light-emitting diodes (PHOLEDs) with multiple quantum well (MQW) structures which confine triplet exciton inside an emitting layer (EML) region. Five types of triplet MQW OLEDs, from a single to five quantum wells, were fabricated with charge control layers (CCLs) to produce high efficiencies, and their performances were compared with each other.

AIP Advances 2, 012117 (2012)

Piezoelectric superlattices as multi-field internally resonating metamaterials

M. Senesi and M. Ruzzene

The authors investigate piezoelectric superlattices (PSLs) as examples of internally resonating metamaterials. The study is conducted through the application of the Partial Wave Expansion (PWE) method and complemented by the development of homogenized relations which aid the investigation of the resonating equivalent properties of the system at long wavelengths.

AIP Advances 1, 041504 (2011)