Synthesis and characterization of highly efficient blue Ir(III) complexes by tailoring β-diketonate ancillary ligand for highly efficient PhOLED applications

Ganguri Sarada, Bomi Sim, Chang Ki Moon, Woosum Cho, Kwon Hyeon Kim, Vijaya Gopalan Sree, Eunju Park, Jang Joo Kim, Sung Ho Jin

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We synthesized two new heteroleptic blue-emitting Ir(III) complexes tBuCN-FIrmMes and tBuCN-FIrdMes by using systematically tailored ancillary ligands 1-mesitylbutane-1,3-dione (mMes) and 1,3-dimesitylpropane-1,3-dione (dMes), respectively. Near-unity photoluminescence quantum yield (PLQY: 96 ± 3%) was achieved for tBuCN-FIrmMes in doped films with short phosphorescence lifetime and high horizontal dipole ratio (Θ: 76%) than the di-mesityl complex, tBuCN-FIrdMes (PLQY: 75 ± 3%, Θ: 71%). Here, introduction of mMes reduces the singlet-triplet splitting energy (ΔEST), permanent dipole moment (μ), and the symmetry of tBuCN-FIrmMes as compared with tBuCN-FIrdMes, these parameters can highly affect the PLQY and Θ values. As a result, the blue phosphorescent organic light-emitting diode (PhOLED) of tBuCN-FIrmMes exhibits high external quantum efficiency (EQE) of ≥ 20% throughout a wide luminance range 1000–10000 cd/m2 with a very low efficiency roll-off, which is crucial for solid-state lighting applications.

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalOrganic Electronics
Volume39
DOIs
StatePublished - 1 Dec 2016

Keywords

  • Blue PhOLEDs
  • High photoluminescence quantum yields
  • Low efficiency roll-off
  • β-diketonate ancillary ligands

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