Systematic Control of the Orientation of Organic Phosphorescent Pt Complexes in Thin Films for Increased Optical Outcoupling

Kim, Jongchan; Batagoda, Thilini; Lee, Jaesang; Sylvinson, Daniel; Ding, Kan; Saris, Patrick J. G.; Kaipa, Ushasree; Oswald, Iain W. H.; Omary, Mohammad A.; Thompson, Mark E.; Forrest, Stephen R.

doi:10.1002/adma.201900921

Title: Systematic Control of the Orientation of Organic Phosphorescent Pt Complexes in Thin Films for Increased Optical Outcoupling

Journal Article · 13 June 2019 · Advanced Materials

DOI: https://doi.org/10.1002/adma.201900921 · OSTI ID:1526323

Kim, Jongchan ^[1]; Batagoda, Thilini ^[2]; Lee, Jaesang ^[1]; Sylvinson, Daniel ^[2]; Ding, Kan ^[3]; Saris, Patrick J. G. ^[2]; Kaipa, Ushasree ^[4]; Oswald, Iain W. H. ^[4]; Omary, Mohammad A. ^[4]; Thompson, Mark E. ^[2];

^[5]

Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA
Department of Chemistry University of Southern California Los Angeles CA USA
Departments of Physics and Materials Science and Engineering University of Michigan Ann Arbor MI USA
Department of Chemistry University of North Texas Denton TX 76203 USA
Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA, Departments of Physics and Materials Science and Engineering University of Michigan Ann Arbor MI USA

Abstract Orienting light‐emitting molecules relative to the substrate is an effective method to enhance the optical outcoupling of organic light‐emitting devices. Platinum(II) phosphorescent complexes enable facile control of the molecular alignment due to their planar structures. Here, the orientation of Pt(II) complexes during the growth of emissive layers is controlled by two different methods: modifying the molecular structure and using structural templating. Molecules whose structures are modified by adjusting the diketonate ligand of the Pt complex, dibenzo‐( f , h )quinoxaline Pt dipivaloylmethane, (dbx)Pt(dpm), show an ≈20% increased fraction of horizontally aligned transition dipole moments compared to (dbx)Pt(dpm) doped into a 4,4′‐bis( N ‐carbazolyl)‐1,1′‐biphenyl, CBP, host. Alternatively, a template composed of highly ordered 3,4,9,10‐perylenetetracarboxylic dianhydride monolayers is predeposited to drive the alignment of a subsequently deposited emissive layer comprising (2,3,7,8,12,13,17,18‐octaethyl)‐21H,23H‐porphyrinplatinum(II) doped into triindolotriazine. This results in a 60% increase in horizontally aligned transition dipole moments compared to the film deposited in the absence of the template. The findings provide a systematic route for controlling molecular alignment during layer growth, and ultimately to increase the optical outcoupling in organic light‐emitting diodes.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐EE0007626

OSTI ID:: 1526323

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Vol. 31 Journal Issue: 32; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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