A novel oligomer PPV derivative(OPPV)is reported,which is designed to contain the oxadiazole function segment in the main chain.Photoluminescence of the OPPV thin Him originates from aggregated states.In a double laye...A novel oligomer PPV derivative(OPPV)is reported,which is designed to contain the oxadiazole function segment in the main chain.Photoluminescence of the OPPV thin Him originates from aggregated states.In a double layer device consisting of poly phenylene vinylene(PPV)and OPPV,emission only from PPV layer was observed and the efficiency of the device was improved by about one order of magnitude compared with the single layer PPV device,this indicates the electron transport characteristic of OPPV.In the OPPV/Tb complex device^OPPV functions as the hole transport layer.A possible explanation is proposed.展开更多
The upconversion luminescence of oxyfluoride transparent vitroceramics codoped with Er^(3+) and Yb^(3+) has been studied experimentally. There are microcrystallites to form in the oxyfluoride glass which is treated ov...The upconversion luminescence of oxyfluoride transparent vitroceramics codoped with Er^(3+) and Yb^(3+) has been studied experimentally. There are microcrystallites to form in the oxyfluoride glass which is treated over its transi tion temperature, and the transparent vitroceramics are obtained. The vitroceramics has the better transparency and a high upconversion luminescent efficiency. Our results show that there is strong energy transfer between Er^(3+) and Yb^(3+) in the vitroceramics, which results in the change of the upconversion spectra with intensity of excitation laser.展开更多
Based on the calculations about scattering rates,the electron acceleration process of ZnS-type thin film electroluminescent devices is studied in detail through Monte Carlo method.The acceleration time and drift lengt...Based on the calculations about scattering rates,the electron acceleration process of ZnS-type thin film electroluminescent devices is studied in detail through Monte Carlo method.The acceleration time and drift length before the balance of acceleration and Scattering are about 200 fs and 30-40nm,respectively.The steady average kinetic energy of electrons increases with electric field.Field emission process of electrons trapped at interface states only affects the acceleration process of electron transport and makes no influence on steady state.New explanations about the“dead layer”phenomenon and the overshoot in the averge drift velocity are proposed based on the calculations.展开更多
In this letter we report a new kind of organic light emitting diode in which an inorganic material was used as electron transport layer.The incorporation of this inorganic material layer increased the brightness in on...In this letter we report a new kind of organic light emitting diode in which an inorganic material was used as electron transport layer.The incorporation of this inorganic material layer increased the brightness in one order.展开更多
A new blue thin film electroluminescence(TFEL)phosphor Gd_(3)Ga_(5)O_(12):Ag is prepared by electron beam evaporation.Photoluminescence and Electroluminescence of Gd_(3)Ga_(5)O_(12):Ag film were investigated.The lumin...A new blue thin film electroluminescence(TFEL)phosphor Gd_(3)Ga_(5)O_(12):Ag is prepared by electron beam evaporation.Photoluminescence and Electroluminescence of Gd_(3)Ga_(5)O_(12):Ag film were investigated.The luminance of TFEL device excited by an alternating-current sinusoidal voltage with frequency of 1000 Hz is about 2cd/m^(2).展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.29992530.
文摘A novel oligomer PPV derivative(OPPV)is reported,which is designed to contain the oxadiazole function segment in the main chain.Photoluminescence of the OPPV thin Him originates from aggregated states.In a double layer device consisting of poly phenylene vinylene(PPV)and OPPV,emission only from PPV layer was observed and the efficiency of the device was improved by about one order of magnitude compared with the single layer PPV device,this indicates the electron transport characteristic of OPPV.In the OPPV/Tb complex device^OPPV functions as the hole transport layer.A possible explanation is proposed.
基金Supported in Part by National Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,and Paper's Foudation of Northern Jiaotong university.
文摘The upconversion luminescence of oxyfluoride transparent vitroceramics codoped with Er^(3+) and Yb^(3+) has been studied experimentally. There are microcrystallites to form in the oxyfluoride glass which is treated over its transi tion temperature, and the transparent vitroceramics are obtained. The vitroceramics has the better transparency and a high upconversion luminescent efficiency. Our results show that there is strong energy transfer between Er^(3+) and Yb^(3+) in the vitroceramics, which results in the change of the upconversion spectra with intensity of excitation laser.
基金Supported by 863 High Technology Program and Doctoral Point Foundation of National Education Committee。
文摘Based on the calculations about scattering rates,the electron acceleration process of ZnS-type thin film electroluminescent devices is studied in detail through Monte Carlo method.The acceleration time and drift length before the balance of acceleration and Scattering are about 200 fs and 30-40nm,respectively.The steady average kinetic energy of electrons increases with electric field.Field emission process of electrons trapped at interface states only affects the acceleration process of electron transport and makes no influence on steady state.New explanations about the“dead layer”phenomenon and the overshoot in the averge drift velocity are proposed based on the calculations.
文摘In this letter we report a new kind of organic light emitting diode in which an inorganic material was used as electron transport layer.The incorporation of this inorganic material layer increased the brightness in one order.
基金Supported by Doctor Point Foundation under Grant No.97000401National“863 Program”of China under Grant No.715-0082Key Laboratory of Excited State Processes,Chinese Academy of Sciences.
文摘A new blue thin film electroluminescence(TFEL)phosphor Gd_(3)Ga_(5)O_(12):Ag is prepared by electron beam evaporation.Photoluminescence and Electroluminescence of Gd_(3)Ga_(5)O_(12):Ag film were investigated.The luminance of TFEL device excited by an alternating-current sinusoidal voltage with frequency of 1000 Hz is about 2cd/m^(2).
