研究目的
Developing insoluble cross-linkable functional layers for solution-processed organic light emitting diodes (OLEDs) with low cross-linking temperature and high hole mobility.
研究成果
The introduction of cationic photoinitiator OPPI drastically dropped the cross-linking temperature to 120 °C and dramatically enhanced the hole mobility. The devices demonstrated excellent performance with higher current density and lower Von. This work provided a simple strategy to develop hole transporting layers with low cross-linking temperature and high mobility, which is promising for solution-processing OLEDs.
研究不足
The cross-linking temperature of undoped V-TPAVTPD and V-TPAVCBP are over 150 °C, which is beyond the tolerance of the plastic substrates used for flexible OLEDs.
1：Experimental Design and Method Selection:
Two vinyl-based cross-linkable hole transporting materials, V-TPAVTPD and V-TPAVCBP, were designed and synthesized. Cationic photoinitiator OPPI was introduced to chemically induce vinyl-based photo cross-linking process.
2：Sample Selection and Data Sources:
Glass substrates with patterned indium-tin oxide (ITO) were utilized for device fabrication.
3：List of Experimental Equipment and Materials:
Chemical materials were purchased from Aladdin or Energy Chemical Ltd. PEDOT:PSS(4083) solution, TCTA, Ir(mppy)3, mCP, Ir(piq)2(acac), and TPBi were purchased from Xi’an Polymer Light Technology Corporation.
4：Experimental Procedures and Operational Workflow:
Devices were fabricated by spin-coating and vacuum evaporation processes. Cross-linking was carried out at 120 °C after UV irradiation.
5：Data Analysis Methods:
Photophysical properties were investigated by UV-vis absorption spectroscopy and UPS. Hole mobility was measured by space-charge-limited current method (SCLC).
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