Homoleptic Ir_((III))based carbene complexes are known to be the most promising emitters of future blue OLED devices.To provide the proof-of-concept,we designed a series of functional di-CF_(3)-functionalized benzo[d]...Homoleptic Ir_((III))based carbene complexes are known to be the most promising emitters of future blue OLED devices.To provide the proof-of-concept,we designed a series of functional di-CF_(3)-functionalized benzo[d]imidazol-3-ium pro-chelates,which could afford single product emitters after proper modification.For benzoimidazol-2-ylidene with an N-methyl substituent,selective formation of the product can be achieved by introduction of t-butylphenyl for the phenyl group,as shown by shifting the product from mixed m-Ir(dfp)_(3)and f-Ir(dfp)_(3)to the single isomer f-Ir(dfpb)_(3).Alternatively,for di-N-aryl substituted carbene chelates,the steric encumbrance imposed between the ortho-CF_(3)group and the adjacent N-aryl substituent redirects the cyclometalation to the other N-aryl substituent,leading to the formation of one single product,e.g.,f-Ir(tBpp)_(3)and f-Ir(ptBp)_(3).Moreover,the doped OLED based on f-Ir(tBpp)_(3)delivered true-blue emission centered at 457 nm and a maximum EQE of 15.6%.Furthermore,upon addition of terminal emittersν-DABNA and t-DABNA,the respective hyper^(-)OLEDs exhibited narrowband blue emission with a maximum EQE of 18.9%at 474 nm and 18.1%at 462 nm,respectively.These highlighted the potential of these Ir_((III))emitters in the fabrication of blue OLEDs.展开更多
Nonreciprocal optical devices are key components in photonic integrated circuits for light reflection blocking and routing.Most reported silicon integrated nonreciprocal optical devices to date were unit devices.To al...Nonreciprocal optical devices are key components in photonic integrated circuits for light reflection blocking and routing.Most reported silicon integrated nonreciprocal optical devices to date were unit devices.To allow complex signal routing between multiple ports in photonic networks,multi-port magneto-optical(MO)nonreciprocal photonic devices are desired.In this study,we report experimental demonstration of a silicon integrated5×5 nonreciprocal optical router based on a magneto-optical phased array.By introducing different nonreciprocal phase shifts to planar photonic waveguides,the device focuses light to different ports for both forward and backward propagation directions.The device shows designable nonreciprocal optical transmission between5×5 ports,achieving 16 dB isolation ratio and-18 dB crosstalk.展开更多
基金supported by funding from the Research Grant Council(CityU 11304221 and CityU 11312722)the City University of Hong Kong,Hong Kong SAR。
文摘Homoleptic Ir_((III))based carbene complexes are known to be the most promising emitters of future blue OLED devices.To provide the proof-of-concept,we designed a series of functional di-CF_(3)-functionalized benzo[d]imidazol-3-ium pro-chelates,which could afford single product emitters after proper modification.For benzoimidazol-2-ylidene with an N-methyl substituent,selective formation of the product can be achieved by introduction of t-butylphenyl for the phenyl group,as shown by shifting the product from mixed m-Ir(dfp)_(3)and f-Ir(dfp)_(3)to the single isomer f-Ir(dfpb)_(3).Alternatively,for di-N-aryl substituted carbene chelates,the steric encumbrance imposed between the ortho-CF_(3)group and the adjacent N-aryl substituent redirects the cyclometalation to the other N-aryl substituent,leading to the formation of one single product,e.g.,f-Ir(tBpp)_(3)and f-Ir(ptBp)_(3).Moreover,the doped OLED based on f-Ir(tBpp)_(3)delivered true-blue emission centered at 457 nm and a maximum EQE of 15.6%.Furthermore,upon addition of terminal emittersν-DABNA and t-DABNA,the respective hyper^(-)OLEDs exhibited narrowband blue emission with a maximum EQE of 18.9%at 474 nm and 18.1%at 462 nm,respectively.These highlighted the potential of these Ir_((III))emitters in the fabrication of blue OLEDs.
基金National Natural Science Foundation of China(52450018,U22A20148,52021001,52473292)Sichuan Provincial Science and Technology Department(2025ZNSFSC0040,2024NSFSC0484)+1 种基金China Postdoctoral Science Foundation(2024M762284)Open Foundation of Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education(ZYGXKPKFJJ20240011-2)。
文摘Nonreciprocal optical devices are key components in photonic integrated circuits for light reflection blocking and routing.Most reported silicon integrated nonreciprocal optical devices to date were unit devices.To allow complex signal routing between multiple ports in photonic networks,multi-port magneto-optical(MO)nonreciprocal photonic devices are desired.In this study,we report experimental demonstration of a silicon integrated5×5 nonreciprocal optical router based on a magneto-optical phased array.By introducing different nonreciprocal phase shifts to planar photonic waveguides,the device focuses light to different ports for both forward and backward propagation directions.The device shows designable nonreciprocal optical transmission between5×5 ports,achieving 16 dB isolation ratio and-18 dB crosstalk.
