A white-light-emitting molecule: frustrated energy transfer between constituent emitting centers.
White-light-emitting single molecules are promising materials for use in a new generation of displays and light sources because they offer the possibility of simple fabrication with perfect color reproducibility and stability. To realize white-light emission at the molecular scale, thereby eliminating the detrimental concentration- or environment-dependent energy transfer problem in conventional fluorescent or phosphorescent systems, energy transfer between a larger band-gap donor and a smaller band-gap acceptor must be fundamentally blocked. Here, we present the first example of a concentration-independent ultimate white-light-emitting molecule based on excited-state intramolecular proton transfer materials. Our molecule is composed of covalently linked blue- and orange-light-emitting moieties between which energy transfer is entirely frustrated, leading to the production of reproducible, stable white photo- and electroluminescence.
Park
Sanghyuk
S
Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744, Korea.
Kwon
Ji Eon
JE
Kim
Se Hun
SH
Seo
Jangwon
J
Chung
Kyeongwoon
K
Park
Sun-Young
SY
Jang
Du-Jeon
DJ
Milián Medina
Begoña
B
Gierschner
Johannes
J
Park
Soo Young
SY