研究目的
To synthesize new blue phosphorescent iridium complexes with trifluorosulfonyl substituents for use in high-efficiency phosphorescent organic light-emitting diodes (PHOLEDs), aiming to achieve deep blue emission and improved device performance.
研究成果
The synthesized iridium complexes exhibit wide band gaps, deep HOMO levels, and excellent thermal stability. The SOCF3mpic-doped device showed higher efficiencies due to reduced triplet-triplet annihilation and better molecular orientation, making it a promising candidate for blue PHOLEDs. Future work could explore further optimizations and applications in displays and lighting.
研究不足
The study focuses on specific iridium complexes and may not generalize to other materials. Device efficiencies are moderate, and further optimization might be needed for commercial applications. The use of vacuum processing and specific host materials could limit scalability or cost-effectiveness.
1:Experimental Design and Method Selection:
The study involved synthesizing two new iridium complexes (SOCF3pic and SOCF3mpic) with trifluoromethyl sulfonyl substituents, characterizing their properties, and fabricating PHOLED devices to evaluate performance. Methods included Stille coupling reactions, Nonoyama reaction, and various spectroscopic and electrochemical analyses.
2:Sample Selection and Data Sources:
Samples were the synthesized iridium complexes and device layers. Materials were purchased from Aldrich and TCI.
3:List of Experimental Equipment and Materials:
Equipment included Bruker Avance NMR spectrometers, TA instruments TGA and DSC analyzers, Shimadzu UV spectrophotometer, Perkin Elmer fluorescence spectrophotometer, Epsilon C3 cyclic voltammeter, and GI-WAXD setup at Pohang Light Source. Materials included chloroform, acetonitrile, tetrabutyl ammonium perchlorate, and various organic compounds for device fabrication.
4:Experimental Procedures and Operational Workflow:
Synthesis of ligands and complexes, characterization using NMR, TGA, DSC, UV-vis, PL, CV, and GI-WAXD measurements. Device fabrication involved vacuum deposition of layers including ITO, MoO3, TAPC, TCTA:4PTPS:Ir complexes, TPBi, Liq, and Al, followed by performance measurement.
5:Data Analysis Methods:
Data were analyzed using standard techniques for spectroscopy, electrochemistry, and diffraction patterns, with software tools not specified.
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NMR Spectrometer
Avance-300MHz
Bruker
Recording 1H NMR spectra for characterization of synthesized compounds.
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NMR Spectrometer
Avance-500MHz
Bruker
Recording 1H NMR spectra for characterization of synthesized compounds.
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UV-Visible Spectrophotometer
UV-1065PC
Shimadzu
Measuring UV-visible absorption spectra of the iridium complexes.
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Fluorescence Spectrophotometer
LS50B
Perkin Elmer
Measuring photoluminescence spectra of the iridium complexes.
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Keithley 236
236
Keithley
Measuring current density and luminance of OLED devices.
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Thermogravimetric Analyzer
2050
TA Instruments
Performing thermogravimetric analysis under nitrogen to determine decomposition temperatures.
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Differential Scanning Calorimeter
DSC Q10
TA Instruments
Conducting differential scanning calorimetry under nitrogen to measure glass transition temperatures.
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Cyclic Voltammeter
Epsilon C3
Measuring electrochemical properties to determine HOMO levels.
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GI-WAXD Setup
Pohang Light Source
Performing grazing incidence wide-angle X-ray diffraction to characterize molecular orientation in films.
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CCD Detector
MX170-HS
Rayonix
Recording 2D GI-WAXD images.
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CS-1000
CS-1000
Konica Minolta
Measuring efficiencies of OLED devices.
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