TY - JOUR
T1 - Synthesis and characterization of highly efficient blue Ir(III) complexes by tailoring β-diketonate ancillary ligand for highly efficient PhOLED applications
AU - Sarada, Ganguri
AU - Sim, Bomi
AU - Moon, Chang Ki
AU - Cho, Woosum
AU - Kim, Kwon Hyeon
AU - Sree, Vijaya Gopalan
AU - Park, Eunju
AU - Kim, Jang Joo
AU - Jin, Sung Ho
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/12/1
Y1 - 2016/12/1
N2 - 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.
AB - 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.
KW - Blue PhOLEDs
KW - High photoluminescence quantum yields
KW - Low efficiency roll-off
KW - β-diketonate ancillary ligands
UR - https://www.scopus.com/pages/publications/84989170900
U2 - 10.1016/j.orgel.2016.09.030
DO - 10.1016/j.orgel.2016.09.030
M3 - Article
AN - SCOPUS:84989170900
SN - 1566-1199
VL - 39
SP - 91
EP - 99
JO - Organic Electronics
JF - Organic Electronics
ER -