Synthesis and characterization of thermally cross-linkable hole injection polymer based on poly(10-alkylphenothiazine) for polymer light-emitting diode |
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| Authors: | Mi Seon Jung Woong Shin Sang Jun Park Hyeri You Jung Bae Park Hongsuk Suh Younhee Lim Do Yeung Yoon Joo Hyun Kim |
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| Affiliation: | aDivision of Applied Chemical Engineering, Department of Polymer Engineering, Pukyong National University, Yongdang-dong, San 100, Nam-gu, Busan 608-739, Republic of Korea;bDepartment of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea;cDepartment of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea |
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| Abstract: | A new thermally cross-linkable hole injecting/transporting polymer, poly{[10-hexyl-10H-phenothiazine-3,7-diyl]-alt-[10-(6-hexyloxy-4-(2-methyl-acrylic acid benzyl ester))-10H-phenothiazine-3,7-diyl]} (PTMMA), was synthesized. From the HOMO energy level of thermally cured PTMMA (−4.95 eV), the polymer is a very good hole injection material. From the spectroscopic and electrochemical data, thermally cured PTMMA (c-PTMMA) film is very safe for the successive layer coating by the solution process. Bi-layer structured polymer light-emitting diode with c-PTMMA as a hole injection layer (HIL) and green-emitting copolymer (PF9B) as a emissive layer was fabricated successfully. The maximum efficiency and brightness of the device with c-PTMMA as a HIL (device II) are 0.34 cd/A and 854 cd/m2, respectively, which are superior to those of the device without c-PTMMA (device I, 0.039 cd/A and 228 cd/m2, respectively). Also, the turn-on electric field of device II (0.89 MV/cm) is much lower compared to that of device I (1.92 MV/cm). From the results, thermally cured PTMMA has not only good hole injection property but also good solvent resistant property for the successive layer coating. |
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| Keywords: | Light-emitting diode Hole injecting material Luminescence |
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