New phosphorescent iridium(iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs

Zhang, Hongyang1,2,3; Wang, Haitao3; Tanner, Kevin4; Schlachter, Adrien4; Chen, Zhao5; Harvey, Pierre D.4; Chen, Shuming6; Wong, Wai-Yeung1,2,3

2021-08-14

10.1039/d1dt01557e

DALTON TRANSACTIONS   影响因子和分区

1477-9226

1477-9234

A series of heteroleptic Ir(iii) complexes composed of two cyclometalated C<^>N ligands and one dipyrrinato ligand used as an ancillary ligand are synthesized and characterized. With the introduction of a fluorine atom, phenyl ring or diphenylamino group into both C<^>N ligands and by keeping the ancillary ligand unchanged, these Ir(iii) dipyrrinato phosphors do not show an obvious shift in their emission bands. They exhibit emissions extending well into the near-infrared region with an intense band located at around 685 nm in both photo- and electroluminescence spectra, and the deep red to near-infrared organic light emitting diodes (OLEDs) based on them afforded a maximum external quantum efficiency of 2.8%. Density functional theory (DFT) calculations show that both the electronic contributions on the lowest unoccupied molecular orbitals (LUMOs) and the highest energy semi-occupied molecular orbitals (HSOMOs) are mainly localized on the dipyrrinato ligand, indicating that the ancillary ligand, which remains unchanged in this series, exhibits a lower triplet state energy in the iridium phosphors than those involving the C<^>N ligands. Therefore a switch from "(C<^>N)(2)Ir" to dipyrrinato ligand-based emission is observed in these iridium(iii) complexes.

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51873176] ; Hong Kong Research Grants Council[PolyU153058/19P] ; Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials[2019B121205002] ; Hong Kong Polytechnic University[1-ZE1C] ; Endowed Professorship in Energy from Ms Clarea Au[847S]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000680968500035

ROYAL SOC CHEMISTRY

20213210734794

Density functional theory ; Electroluminescence ; Infrared devices ; Ligands ; Light emission ; Molecular orbitals ; Organic light emitting diodes (OLED) ; Phosphors ; Synthesis (chemical)

Semiconductor Devices and Integrated Circuits:714.2 ; Light, Optics and Optical Devices:741 ; Light/Optics:741.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Probability Theory:922.1

CHEMISTRY

Web of Science

1.Hong Kong Polytech Univ PolyU, Dept Appl Biol & Chem Technol, Hong Kong, Peoples R China
2.PolyU Shenzhen Res Inst, Shenzhen 518057, Peoples R China
3.Hong Kong Baptist Univ, Dept Chem, Waterloo Rd, Hong Kong, Peoples R China
4.Univ Sherbrooke, Dept Chim, 2550 Blvd Univ, Sherbrooke, PQ J1K 2R1, Canada
5.Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Peoples R China
6.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518000, Peoples R China

Zhang, Hongyang,Wang, Haitao,Tanner, Kevin,et al. New phosphorescent iridium(iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs[J]. DALTON TRANSACTIONS,2021,50(30):10629-10639.

Zhang, Hongyang.,Wang, Haitao.,Tanner, Kevin.,Schlachter, Adrien.,Chen, Zhao.,...&Wong, Wai-Yeung.(2021).New phosphorescent iridium(iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs.DALTON TRANSACTIONS,50(30),10629-10639.

Zhang, Hongyang,et al."New phosphorescent iridium(iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs".DALTON TRANSACTIONS 50.30(2021):10629-10639.