Premium
Micromechanism of electroplex formation
Author(s) -
Wei Mingyang,
Gui Guan,
Chung YaoHsien,
Xiao Lixin,
Qu Bo,
Chen Zhijian
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552098
Subject(s) - electroluminescence , electric field , photoluminescence , optoelectronics , diode , biasing , voltage , polaron , materials science , oled , emission spectrum , charge (physics) , light emission , spectral line , nanotechnology , physics , electrical engineering , engineering , electron , layer (electronics) , quantum mechanics , astronomy
In this work, we have provided a new possible explanation for the micromechanism of electroplex. The time‐resolved electroluminescent spectra of light‐emitting diodes based on the blend of TAPC and TpPyPB were measured. They show that when a high bias voltage is applied on the devices, the electroplex emission gradually increases over time. After the devices worked at a high bias voltage, a strong electroplex emission can be maintained at low bias voltage, but the peaks related to the electroplex are still insignificant in photoluminescence. These results may suggest that the electroplex is a charge–transfer complex with changed conformation caused by polaron‐induced molecular aggregation under electric field in essence, though further investigation is needed. Using materials with morphology stability under an electric field, electroplex was greatly reduced, which may enlarge the consideration in designing exciplex‐based organic light‐emitting diodes (ExOLEDs).