Boosting Efficiency of Near-Infrared Organic Light-Emitting Diodes with Os(II)-Based Pyrazinyl Azolate Emitters

Yuan, Yi1,2; Liao, Jia-Ling3,4; Ni, Shao-Fei5; Jen, Alex K. -Y.1; Lee, Chun-Sing1,2; Chi, Yun1,3,4

2019-11-18

10.1002/adfm.201906738

ADVANCED FUNCTIONAL MATERIALS   影响因子和分区

1616-301X

1616-3028

Tremendous effort has been devoted to developing novel near-infrared (NIR) emitters and to improving the performance of NIR organic light-emitting diodes (OLEDs). Os(II) complexes are known to be an important class of NIR electroluminescent materials. However, the highest external quantum efficiency achieved so far for Os(II)-based NIR OLEDs with an emission peak wavelength exceeding 700 nm is still lower than 3%. A new series of Os(II) complexes (1-4) based on functional pyrazinyl azolate chelates and dimethyl(phenyl)phosphane ancillaries is presented. The reduced metal-to-ligand charge transfer (MLCT) transition energy gap of pyrazinyl units in the excited states results in efficient NIR emission for this class of metal complexes. Consequently, NIR OLEDs based on 1-4 show excellent device performance, among which complex 4 with a triazolate fragment gives superior performance with maximum external quantum efficiency of 11.5% at peak wavelength of 710 nm, which represent the best Os(II)-based NIR-emitting OLEDs with peak maxima exceeding 700 nm.

N-donor near-infrared emission organic light-emitting diodes osmium phosphorescence

SCI ; EI

英语

NI期刊

其他

City University of Hong Kong[] ; Ministerio de Ciencia y Tecnología[]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000496775700001

WILEY-V C H VERLAG GMBH

20194807746052

Charge transfer ; Diodes ; Infrared devices ; Metal complexes ; Organic light emitting diodes (OLED) ; Osmium ; Phosphorescence ; Quantum efficiency

Precious Metals:547.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Quantum Theory; Quantum Mechanics:931.4

MATERIALS SCIENCE

Web of Science

1.City Univ Hong Kong, Dept Mat Sci & Engn, Dept Chem, Hong Kong, Peoples R China
2.City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Hong Kong, Peoples R China
3.Natl Tsing Hua Univ, Dept Chem, Hsinchu 30013, Taiwan
4.Natl Tsing Hua Univ, Frontier Res Ctr Fundamental & Appl Sci Matters, Hsinchu 30013, Taiwan
5.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China

Yuan, Yi,Liao, Jia-Ling,Ni, Shao-Fei,et al. Boosting Efficiency of Near-Infrared Organic Light-Emitting Diodes with Os(II)-Based Pyrazinyl Azolate Emitters[J]. ADVANCED FUNCTIONAL MATERIALS,2019,30(5).

Yuan, Yi,Liao, Jia-Ling,Ni, Shao-Fei,Jen, Alex K. -Y.,Lee, Chun-Sing,&Chi, Yun.(2019).Boosting Efficiency of Near-Infrared Organic Light-Emitting Diodes with Os(II)-Based Pyrazinyl Azolate Emitters.ADVANCED FUNCTIONAL MATERIALS,30(5).

Yuan, Yi,et al."Boosting Efficiency of Near-Infrared Organic Light-Emitting Diodes with Os(II)-Based Pyrazinyl Azolate Emitters".ADVANCED FUNCTIONAL MATERIALS 30.5(2019).