Processable donor–acceptor type electrochromes switching between multicolored and highly transmissive states towards single component RGB-based display devices
Abidin Balan, Derya Baran and Levent Toppare
J. Mater. Chem., 2010, Advance Article
DOI: 10.1039/C0JM01815E, Paper
Levant Toppare and his team reported last year in ChemComm on the synthesis of a polymer (PTBT) with the capability to switch between all RGB colours, black and transmissive states. In this Journal of Materials Chemistry ‘Hot Article’ donor acceptor type PTBTs (PTBT-DAs) with alternating alkyl chain substitution were synthesized and characterized in terms of their electrochemical and optical properties.
The electrochemical and spectral results demonstrate that in the context of low cost flexible display device technology, requirements for polymers showing multicoloured and transmissive states can be fulfilled by PTBT-DAs.
Interested in reading more? Read for free here until November 19th.
Anomalous Eu layer doping in Eu, Si co-doped aluminium nitride based phosphor and its direct observation
Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie, Koji Kimoto and Mitsuhiro Saito
J. Mater. Chem., 2010, Advance Article
DOI: 10.1039/C0JM02096F, Paper
Takeshi Takeda and colleagues in Japan have provided insight into the luminescent properties of Eu, Si co-doped AlN. This material shows blue luminescence by UV and electron excitation. However, it is not clear how Eu is located in the wurtzite AlN lattice as there is not enough space for a large Eu cation. In the present study, the team from The National Institute of Materials Science and Tohoku University set out to elucidate the luminescent Eu centre’s location and the role of co-dopant Si.
Their findings show that Si co-doping is essential for Eu incorporation into AlN and that Eu forms a single layer structure with the Si condensation between the AlN wurtzite blocks. Their work indicates that layer type doping can be used to design new phosphors.
Interested in reading more? Read for free here until November 19th.
