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UV–vis absorption spectrum of TBH solution and PL spectrum of PF thin film. The overlap of the two spectra infers energy transfer in this system. The inset is the structure of the TBH compound.
(a) The PL and (b) EL spectra of the doped polymer with different doping levels. The difference of the spectra shape between PL and EL is caused by different mechanisms. The inset of (b) is the CIE coordinate graph of the device with 1% TBH doping at different current densities ranging from .
The device curves at 1% doping level. The device turns on at , but the emission appears at around , this delay suggests that the charge is still not balanced well and the device still can be improved.
Device performance under different doping levels.
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