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Improved Efficiency of Hybrid Inorganic‐Organic Light Emitting Diodes
Author(s) -
Jayabharathi Jayaraman,
Prabhakaran Annadurai,
Thanikachalam Venugopal,
Sundharesan Munusamy
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600455
Subject(s) - materials science , optoelectronics , doping , heterojunction , light emitting diode , diode , common emitter , oled , nanotechnology , layer (electronics)
We report the synthesis and characterization, optical and optoelectronic properties of charge carrier materials, namely pristine ZnO, Ag‐doped ZnO and Cu−Ag‐codoped ZnO and their performance with iridium(III)bis‐1‐(4‐methoxyphenyl)‐2‐(4‐naphthalen‐1‐yl)‐4,5‐diphenyl‐1H‐imidazolato‐N,C 2 )(picolinate) as the emitter in green inorganic‐organic hybrid light emitting devices (HyLEDs). The device with 2.0 wt % Cu−Ag‐codoped ZnO nanoparticles shows luminance of 11,842 cd/m 2 at driving voltage 15.0 V, 2.0 wt % Ag‐doped ZnO exhibits luminance of 10,982 cd/m 2 at 19.0 V and 2.0 wt % ZnO shows luminance of 1431 cd/m 2 at 23.0 V. The device with Cu−Ag‐codoped ZnO nanoparticles layer shows higher current efficiency (η c ‐15.4 cd A −1 ) and power efficiency (η p ‐ 9.8 lm W −1 ) than those of the control devices [η c ‐ 13.0 cd A −1 (Ag‐ZnO); 11.4 cd A −1 (ZnO) & η p ‐ 8.4 lm W −1 (Ag‐ZnO); 5.5 l m W −1 (ZnO)]. We have also fabricated the Cu‐ZnO‐MPNDI−Ag heterostructure in which Ag‐MPNDI HIB is higher than the ZnO‐MPNDI HIB and ZnO‐MPNDI EIB is lower than Cu‐ZnO‐MPNDI EIB. Therefore electrons flow from Ag into the ZnO CB is possible until reaching the lowest energy state since ZnO has high electron mobility and hence Ag‐to‐MPNDI‐to‐ZnO charge transfer direction is the dominant one.