Electric-field-induced second harmonic generation(EFISH),a third-order nonlinear process,arises from the interaction between the electric field of an external bias and that of two incident photons.EFISH can be used to...Electric-field-induced second harmonic generation(EFISH),a third-order nonlinear process,arises from the interaction between the electric field of an external bias and that of two incident photons.EFISH can be used to dynamically control the nonlinear optical response of materials and is therefore promising for active nonlinear devices.However,it has been challenging to achieve a strong modulation with EFISH in conventional nonlinear materials.Here,we report a large tunability of an EFISH signal from a subwavelength-thick polymer film sandwiched between a transparent electrode and a metallic mirror.By exploiting the band-edge-enhanced third-order nonlinear susceptibility of the organic conjugated polymer,we successfully demonstrate a gigantic EFISH effect with a modulation ratio up to 422%V^(−1) at a pumping wavelength of 840 nm.The band-edge-enhanced EFISH opens new avenues for modulating the intensity of SHG signals and for controlling nonlinear electro-optic interactions in nanophotonic devices.展开更多
The electroluminescent characteristics of blue organic light-emitting diodes （BOLEDs） fabricated with doped charge carrier transport layers are analyzed. The fluorescent blue dopant BCzVBi is doped in an emissive la...The electroluminescent characteristics of blue organic light-emitting diodes （BOLEDs） fabricated with doped charge carrier transport layers are analyzed. The fluorescent blue dopant BCzVBi is doped in an emissive layer, hole transport layer （HTL） and electron transport layer （ETL）, respectively, to optimize the probability of ex- citon generation in the BOLEDs. The luminance and luminous efficiency of BOLEDs made with BCzVBi-doped HTL and ETL increase by 22% and 17% from 11,683 cd/m2 at 8.5 V and 6.08 cd/A at 4.0 V to 14,264 cd/m2 at 8.5 V and 7.13 cd/A at 4.0 V while CIE coordinates of （0.15, 0.15） of both types of BOLEDs remained unchanged. The electron mobility of BCzVBi is estimated to be 1.02 × 10-5 cm2/Vs by TOF.展开更多
基金financially supported by the National Natural Science Foundation of China(11774145)the Guangdong Provincial Innovation and Entrepreneurship Project(2017ZT07C071)+3 种基金the Applied Science and Technology Project of Guangdong Science and Technology Department(2017B090918001)the Natural Science Foundation of Shenzhen Innovation Committee(JCYJ20170412153113701)the Marie Curie Individual Fellowship(H2020-MSCA-IF-703803-NonlinearMeta)the European Research Council Consolidator Grant(TOPOLOGICAL).
文摘Electric-field-induced second harmonic generation(EFISH),a third-order nonlinear process,arises from the interaction between the electric field of an external bias and that of two incident photons.EFISH can be used to dynamically control the nonlinear optical response of materials and is therefore promising for active nonlinear devices.However,it has been challenging to achieve a strong modulation with EFISH in conventional nonlinear materials.Here,we report a large tunability of an EFISH signal from a subwavelength-thick polymer film sandwiched between a transparent electrode and a metallic mirror.By exploiting the band-edge-enhanced third-order nonlinear susceptibility of the organic conjugated polymer,we successfully demonstrate a gigantic EFISH effect with a modulation ratio up to 422%V^(−1) at a pumping wavelength of 840 nm.The band-edge-enhanced EFISH opens new avenues for modulating the intensity of SHG signals and for controlling nonlinear electro-optic interactions in nanophotonic devices.
基金supported by the Ministry of Education,Science,and Technology (MEST)
文摘The electroluminescent characteristics of blue organic light-emitting diodes （BOLEDs） fabricated with doped charge carrier transport layers are analyzed. The fluorescent blue dopant BCzVBi is doped in an emissive layer, hole transport layer （HTL） and electron transport layer （ETL）, respectively, to optimize the probability of ex- citon generation in the BOLEDs. The luminance and luminous efficiency of BOLEDs made with BCzVBi-doped HTL and ETL increase by 22% and 17% from 11,683 cd/m2 at 8.5 V and 6.08 cd/A at 4.0 V to 14,264 cd/m2 at 8.5 V and 7.13 cd/A at 4.0 V while CIE coordinates of （0.15, 0.15） of both types of BOLEDs remained unchanged. The electron mobility of BCzVBi is estimated to be 1.02 × 10-5 cm2/Vs by TOF.
