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Aromatic Phosphonates: A Novel Group of Emitters Showing Blue Ultralong Room Temperature Phosphorescence
Author(s) -
Thomas Heidi,
Pastoetter Dominik L.,
Gmelch Max,
Achenbach Tim,
Schlögl Annika,
Louis Marine,
Feng Xinliang,
Reineke Sebastian
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000880
Subject(s) - phosphorescence , materials science , photochemistry , luminescence , phosphorescent organic light emitting diode , fluorescence , amorphous solid , oled , optoelectronics , nanotechnology , organic chemistry , chemistry , optics , physics , layer (electronics)
In recent years, there has been a growing interest in purely organic materials showing ultralong room‐temperature phosphorescence with lifetimes in the range of seconds. Still, the longest known phosphorescence lifetimes are only achieved with crystalline systems so far. Here, a rational design of a completely new family of halogen‐free organic luminescent derivatives in amorphous matrices, displaying both conventional fluorescence and phosphorescence is reported. Hydrogen bonding between the newly developed emitters and an ethylene‐vinyl alcohol copolymer (Exceval) matrix, which efficiently suppresses vibrational dissipation, enables bright long‐lived phosphorescence with lifetimes up to 2.6 s at around 480 nm. The importance of the chosen matrix is shown as well as the implementation in an organic programmable luminescent tag.