Orange-Red-Light-Emitting Field-Effect Transistors Based on Phosphorescent Pt(II) Complexes with Area Emission

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• 作者：Robert Wawrzinek ; Khalid Muhieddine ; Mujeeb Ullah ; Peter B. Koszo ; Paul E. Shaw ; Arnaud Grosjean ; Fatemeh Maasoumi ; Dani M. Stoltzfus ; Jack K. Clegg ; Paul L. Burn ; Ebinazar B. Namdas and Shih-Chun Lo
• 刊名：Advanced Optical Materials
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：4
• 期：11
• 页码：1867-1874
• 全文大小：1035K
• ISSN：2195-1071

文摘

Two new heteroleptic Pt(II) complexes bearing an n-hexyloxy substituted phenyllepidine-based ligand and either a picolinate (pic) or acetylacetonate (acac) coligand are synthesized for use in organic light-emitting field-effect transistors (LEFETs). Both compounds are obtained in good yields via a short and straightforward synthetic route. It is found that while both Pt(II) complexes show good chemical stability and solubility, the coligand affects the photoluminescence quantum yield and crystal packing of the complexes. Although aggregate induced phosphorescence enhancement is not observed, it is found that high concentrations of the emitters in a poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] host lead to improved charge injection in hybrid LEFETs. LEFETs with area emission, high ON/OFF ratios (>10⁶) and mobilities (≈1.3 cm² V⁻¹ s⁻¹), and external quantum efficiencies of up to 0.1% at the highest brightness of 855 cd m⁻² are demonstrated.