Colloidal Pb Se nanocrystals(NCs)have gained considerable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ranges.However,the fast degra...Colloidal Pb Se nanocrystals(NCs)have gained considerable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ranges.However,the fast degradation of colloidal Pb Se NCs in ambient conditions hampers their widespread applications in infrared optoelectronics.It is well-known that the inorganic thick-shell over core improves the stability of NCs.Here,we present the synthesis of Pb Se/Pb S core/shell NCs showing wide spectral tunability,in which the molar ratio of lead(Pb)and sulfur(S)precursors,and the concentration of sulfur and Pb Se NCs in solvent have a significant effect on the efficient Pb S shell growth.The infrared light-emitting diodes(IR-LEDs)fabricated with the Pb Se/Pb S core/shell NCs exhibit an external quantum efficiency(EQE)of 1.3%at 1280 nm.The ligand exchange to optimize the distance between NCs and chloride treatment are important processes for achieving high performance on Pb Se/Pb S NC-LEDs.Our results provide evidence for the promising potential of Pb Se/Pb S NCs over the wide range of infrared optoelectronic applications.展开更多
Resonant tunneling diode （RTD） of AlAs/InGaAs/AlAs double barrier-single well structure was designed and fabricated. The devices showed current-voltage characteristics with peak-valley current ratio of 4 ： 1 at roo...Resonant tunneling diode （RTD） of AlAs/InGaAs/AlAs double barrier-single well structure was designed and fabricated. The devices showed current-voltage characteristics with peak-valley current ratio of 4 ： 1 at room temperature. The scattering parameter of RTD was measured by using an HP8510（C） network analyzer. Equivalent circuit parameters were obtained by curve fitting and optimized. The RTD switching time was estimated using the measured capacitance and average negative differential resistance. The minimum rise time of the sample was estimated to be 21 ps.展开更多
通过激光二极管速率方程模拟得出了优化芯片高频性能的基本途径,权衡直流特性和实际生产过程,对腔面反射率、腔长和量子阱结构进行了优化。建立激光二极管小信号等效电路模型,对芯片寄生网络进行了优化。测试了25-125℃下芯片的P-I特性...通过激光二极管速率方程模拟得出了优化芯片高频性能的基本途径,权衡直流特性和实际生产过程,对腔面反射率、腔长和量子阱结构进行了优化。建立激光二极管小信号等效电路模型,对芯片寄生网络进行了优化。测试了25-125℃下芯片的P-I特性,25℃时芯片的阈值电流仅为7.4 m A;芯片温度为25-45℃时,特征温度为102 K;芯片温度为105-125℃时,特征温度为57 K。在25和85℃时,激光二极管在直流偏置30 m A的3 d B频带响应分别为12.8和10.4 GHz。芯片被封装为光发射次模块（TOSA）后,-40,25和85℃下的眼图均满足10 Gbit/s光通信系统的应用要求。展开更多
An excellent organic blue light-emitting diode based on 4,4＇-bis（diphenylamino）-quinque（p-phenylene）s （OPP（5）-NPh） with a maximum luminance of up to 5000 cd/m^2 and a luminanous efficiency of 1.3 cd/A was rep...An excellent organic blue light-emitting diode based on 4,4＇-bis（diphenylamino）-quinque（p-phenylene）s （OPP（5）-NPh） with a maximum luminance of up to 5000 cd/m^2 and a luminanous efficiency of 1.3 cd/A was reported. This diode was made by using a wide band-gap hole-blocking layer, F-TBB instead of PBD in the OLED devices. We attribute the good performance to the one trade-off involved in the use of F-TBB to obtain higher luminance is the increased turn-on voltages and slightly decreased device efficiencies.展开更多
Extensive research is ongoing in the use of Photobiomodulation (PBM, often referred to as low-level or cold laser therapy) to treat Alzheimer’s disease as well as other debilitating diseases. The following case studi...Extensive research is ongoing in the use of Photobiomodulation (PBM, often referred to as low-level or cold laser therapy) to treat Alzheimer’s disease as well as other debilitating diseases. The following case studies further confirm that PBM could be a breakthrough approach to limit the progression of insidious diseases. We present four cases, two with mild to moderate dementia and two with more advanced symptoms. Several publications have shown beneficial results, however, several weeks of daily treatments were necessary. The cases described here suggest that moderate and advanced dementia cases can be significantly improved with three or four eight-minute treatments over a 5 - 7-day period when using super-pulsing technology on Monday-Wednesday-Friday schedule (Figure 1). Gives a brief visual explanation of super-pulsing versus continuous wave technology.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2016YFB0401702)the National Natural Science Foundation of China(Grant Nos.61674074 and 61405089)+6 种基金Development and Reform Commission of Shenzhen Project,China(Grant No.[2017]1395)Shenzhen Peacock Team Project,China(Grant No.KQTD2016030111203005)Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting,China(Grant No.ZDSYS201707281632549)Guangdong Province’s Key R&D Program:Micro-LED Display and Ultra-high Brightness Micro-display Technology,China(Grant No.2019B010925001)Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting,China(Grant No.2017KSYS007)Distinguished Young Scholar of National Natural Science Foundation of Guangdong,China(Grant No.2017B030306010)the start-up fund from Southern University of Science and Technology,Shenzhen,China
文摘Colloidal Pb Se nanocrystals(NCs)have gained considerable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ranges.However,the fast degradation of colloidal Pb Se NCs in ambient conditions hampers their widespread applications in infrared optoelectronics.It is well-known that the inorganic thick-shell over core improves the stability of NCs.Here,we present the synthesis of Pb Se/Pb S core/shell NCs showing wide spectral tunability,in which the molar ratio of lead(Pb)and sulfur(S)precursors,and the concentration of sulfur and Pb Se NCs in solvent have a significant effect on the efficient Pb S shell growth.The infrared light-emitting diodes(IR-LEDs)fabricated with the Pb Se/Pb S core/shell NCs exhibit an external quantum efficiency(EQE)of 1.3%at 1280 nm.The ligand exchange to optimize the distance between NCs and chloride treatment are important processes for achieving high performance on Pb Se/Pb S NC-LEDs.Our results provide evidence for the promising potential of Pb Se/Pb S NCs over the wide range of infrared optoelectronic applications.
基金SUPPORTED BY NATIONAL NATURAL SCIENCE FOUNDATION OF CHINA( NO. 60177010).
文摘Resonant tunneling diode （RTD） of AlAs/InGaAs/AlAs double barrier-single well structure was designed and fabricated. The devices showed current-voltage characteristics with peak-valley current ratio of 4 ： 1 at room temperature. The scattering parameter of RTD was measured by using an HP8510（C） network analyzer. Equivalent circuit parameters were obtained by curve fitting and optimized. The RTD switching time was estimated using the measured capacitance and average negative differential resistance. The minimum rise time of the sample was estimated to be 21 ps.
文摘通过激光二极管速率方程模拟得出了优化芯片高频性能的基本途径,权衡直流特性和实际生产过程,对腔面反射率、腔长和量子阱结构进行了优化。建立激光二极管小信号等效电路模型,对芯片寄生网络进行了优化。测试了25-125℃下芯片的P-I特性,25℃时芯片的阈值电流仅为7.4 m A;芯片温度为25-45℃时,特征温度为102 K;芯片温度为105-125℃时,特征温度为57 K。在25和85℃时,激光二极管在直流偏置30 m A的3 d B频带响应分别为12.8和10.4 GHz。芯片被封装为光发射次模块（TOSA）后,-40,25和85℃下的眼图均满足10 Gbit/s光通信系统的应用要求。
文摘An excellent organic blue light-emitting diode based on 4,4＇-bis（diphenylamino）-quinque（p-phenylene）s （OPP（5）-NPh） with a maximum luminance of up to 5000 cd/m^2 and a luminanous efficiency of 1.3 cd/A was reported. This diode was made by using a wide band-gap hole-blocking layer, F-TBB instead of PBD in the OLED devices. We attribute the good performance to the one trade-off involved in the use of F-TBB to obtain higher luminance is the increased turn-on voltages and slightly decreased device efficiencies.
文摘Extensive research is ongoing in the use of Photobiomodulation (PBM, often referred to as low-level or cold laser therapy) to treat Alzheimer’s disease as well as other debilitating diseases. The following case studies further confirm that PBM could be a breakthrough approach to limit the progression of insidious diseases. We present four cases, two with mild to moderate dementia and two with more advanced symptoms. Several publications have shown beneficial results, however, several weeks of daily treatments were necessary. The cases described here suggest that moderate and advanced dementia cases can be significantly improved with three or four eight-minute treatments over a 5 - 7-day period when using super-pulsing technology on Monday-Wednesday-Friday schedule (Figure 1). Gives a brief visual explanation of super-pulsing versus continuous wave technology.
