研究目的
To design and synthesize hyper-structured molecular (HSM) thermally activated delayed fluorescent (TADF) emitters for non-doped OLEDs, aiming to overcome the problems of phase separation and efficiency roll-off in doping systems.
研究成果
The introduction of TADF units to a 3D CRA core via flexible linkage successfully synthesized HSM TADF emitters with good solubility, thermal stability, and film-forming ability. Non-doped OLEDs using CRA-PXZ-Trz(87.5)-mCP(12.5) as the emitting layer achieved an EQE of 16.7% at 100 cd/m2, demonstrating the potential of HSM design for efficient solution-processable OLEDs.
研究不足
The study focuses on the synthesis and initial characterization of HSM TADF emitters. Further optimization of device performance and stability is needed. The efficiency roll-off at higher luminance levels and the impact of the flexible linkage on device longevity are areas for future research.
1：Experimental Design and Method Selection
Designed HSM TADF emitters with TADF units and host units bound to an inactive core via flexible linkage. Used phenoxazine-triphenyltriazine (PXZ-Trz) as TADF unit, 1,3-bis(9H-carbazol-9-yl)benzene (mCP) as host unit, and calix[4]resorcinarene (CRA) as core. Synthesized via a two-step click reaction.
2：Sample Selection and Data Sources
Synthesized a series of CRA-PXZ-Trz(X)-mCP(100-X) (X=0, 12.5, 25, 50, 75, 87.5, 100) with varying molar ratios of TADF to host units.
3：List of Experimental Equipment and Materials
Used Bruker DPX-400 spectrometer for 1H NMR, Nicolet Is-10 spectrometer for FTIR, Bruker Dsltonics BIFLEX MALDI-TOF mass spectrometer for MALDI-TOF MS, Mettler-Toledo TGA/DSC for thermal analysis, Bruker AXS D8 Advance diffractometer for XRD, Dimension Fast Scan AFM for surface morphology, CHI 660E voltammetric analyzer for CV, Agilent Cary 5000 Spectrophotometer for UV-Vis, Horiba Fluorolog-3 spectrofluorometer for PL spectra.
4：Experimental Procedures and Operational Workflow
Synthesis involved alkyne-azide click reaction between alkyne-containing CRA and azide-containing functional compounds. Purified by column chromatography. OLED devices fabricated by spin-coating and evaporation techniques.
5：Data Analysis Methods
Analyzed thermal stability, photophysical properties, electrochemical behavior, and device performance. Used transient PL decay spectra to confirm TADF feature.
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Bruker DPX-400 spectrometer
DPX-400
Bruker
Used for 1H NMR measurements.
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CHI 660E voltammetric analyzer
660E
CHI
Used for cyclic voltammetry.
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Agilent Cary 5000 Spectrophotometer
Cary 5000
Agilent
Used for UV-Vis absorption spectra.
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Nicolet Is-10 spectrometer
Is-10
Nicolet
Used for FTIR spectra recording.
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Bruker Dsltonics BIFLEX MALDI-TOF mass spectrometer
BIFLEX
Bruker Dsltonics
Used for MALDI-TOF MS spectra.
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Mettler-Toledo TGA/DSC simultaneous thermal analyzer
TGA/DSC
Mettler-Toledo
Used for thermal gravimetric analysis and differential scanning calorimetry.
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Bruker AXS D8 Advance diffractometer
D8 Advance
Bruker AXS
Used for X-ray diffraction analysis.
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Dimension Fast Scan AFM
Fast Scan
Dimension
Used for atomic force microscopy.
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Horiba Fluorolog-3 spectrofluorometer
Fluorolog-3
Horiba
Used for photoluminescence spectra.
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