研究目的
To demonstrate highly efficient, all-solution processed inverted quantum dot light-emitting diodes (QLEDs) with high performance by employing poly(9-vinlycarbazole) (PVK) as additional hole transport layer (HTL) and doping it with a blue thermal activated delay fluorescent (TADF) material, 4,5-bis(carbazol-9-yl)-1,2-dicyanobenzene (2CzPN).
研究成果
The novel scheme of utilizing TADF material and double HTLs in all-solution processed inverted QLEDs provides more options for improving the device performance of the QLEDs and makes a good prospect of flexible display application.
研究不足
The application of the energy transfer medium is still limited in all-solution processed inverted QLEDs due to the solvent corrosion issues.
1：Experimental Design and Method Selection:
The study employs a solution-processed device structure named TADF-QLEDs, which includes the solution-processed double HTLs and the TADF material doped in one HTL.
2：Sample Selection and Data Sources:
Red CdSe/ZnS Core-shell QD dispersion was purchased from Mesolight Inc. PVK, TFB and 2CzPN were purchased from Xi’an Polymer Light Technology Co., Ltd. Phosphomolybdic acid hydrate (PMAH) was purchased from Acros Organics Co., Ltd.
3：List of Experimental Equipment and Materials:
ZnO precursor solution, QD dispersion, PVK, TFB, 2CzPN, PMAH, spin coater, annealing oven, vacuum evaporating system, Horiba Fluorolog-3 spectrofluorometer, SRC-600 spectral radiance colorimeter, Keithley 2410 Source Meter, Shimadzu UV-3101PC spectrometer, AFM measurement (PSIA XE-100), FluoroCube-01-N1, Horiba Instrument.
4：Experimental Procedures and Operational Workflow:
All-solution processed QLEDs with inverted structure of ITO/ZnO/QD/PVK: 2CzPN (5: x)/ TFB /PMAH /Al (80 nm) (x=0, 1, 2 or 3) were fabricated.
5：Data Analysis Methods:
The steady-state photoluminescence (PL) spectrum, the current density-voltage-luminance (J-V-L) characteristics, the EQE data and the electroluminescence (EL) spectra, the absorption spectrum, the surface morphology characteristics, and Time Resolution Photoluminescence (TRPL) test were carried out.
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