A novel rare earth complex Eu（TTA）2（N-HPA）Phen （TTA = thenoyltrifluoroacetone, N-HPA = N-phenylanthranilic acid, and phen = 1,10-phenathroline ）, which contains three different ligands, was synthesized. The Eu c...A novel rare earth complex Eu（TTA）2（N-HPA）Phen （TTA = thenoyltrifluoroacetone, N-HPA = N-phenylanthranilic acid, and phen = 1,10-phenathroline ）, which contains three different ligands, was synthesized. The Eu complex was blended with poly N-vinylcarbazole （PVK） in different weight ratios and spin coated into films. The luminescence properties of films were investigated and energy transfer between PVK and the complex was discussed. Multilayer structural devices consisting of ITO/PVK： Eu （TTA）2 （N-HPA） phen/BCP/Alq3/Al were fabricated with PVK ： Eu （TTA）2（N-HPA） as light-emitting layer. Increasing the concentration of Eu in the PVK thin film would inhibit the emission of PVK to different degrees. Finally, the pure red luminescence of europium（ Ⅲ ） was observed when the doping weight ratio was approximately 1 ： 5, which indicated an effective energy transfer from PVK to rare earth complex.展开更多
We prepare a tandem (OLED) with two independent units and three electrodes. One of the units consists of ITO/TPD/Al_(q3):DCJTB (5%)/LiF/Al/Au, and the other is Al/Au/TPD/Al_(q3)/LiF/Al. Two units sharing one transpare...We prepare a tandem (OLED) with two independent units and three electrodes. One of the units consists of ITO/TPD/Al_(q3):DCJTB (5%)/LiF/Al/Au, and the other is Al/Au/TPD/Al_(q3)/LiF/Al. Two units sharing one transparent intermediate electrode Al/Au, together constitute the entire device. With the same current density, the voltage of the entire device is approximately equal to the sum of two units. The current efficiency of the entire device is several times higher than the sum up of two components. Without directly contacting an external power supply, the bi-metal intermediate electrode has the ability to produce electrons and holes for two adjacent emitting units, respectively. This kind of tandem device is characterized by controllable emission color and higher current efficiency than its two components added up.展开更多
In order to take advantage of organic and inorganic materials,we chose the polymer MEH-PPV as the luminous layer and ZnS as the electron transporting layer to prepare hybrid organic-inorganic light-emitting diodes(HOI...In order to take advantage of organic and inorganic materials,we chose the polymer MEH-PPV as the luminous layer and ZnS as the electron transporting layer to prepare hybrid organic-inorganic light-emitting diodes(HOILEDs):ITO/MEH-PPV(~70 nm)/ZnS(20 nm)/Al by thermal evaporation and spin coating.Compared with the single-layer device ITO/MEH-PPV(~70 nm)/Al,spectral broadening and a slightly red shift are observed.Compared with the pure organic device ITO/MEH-PPV(~70 nm)/BCP(20 nm)/Al and combined with the energy level structure diagram,it is concluded that the spectral broadening and red shift are due to the exciplex luminescence at the interface between MEH-PPV and ZnS or BCP.In addition,the hybrid inorganic-organic device shows a lower turn-on voltage,but the current efficiency is lower than that of the pure organic device with the same structure.展开更多
The properties of poly（3-hexylthiophene）：（6,6）-phenyl C61 butyric acid methyl ester （P3HT：PCBM） organic pho- tovoltaic devices （OPVs） with an indium tin oxide （ITO） anode treated by a KMnO4 solution are in...The properties of poly（3-hexylthiophene）：（6,6）-phenyl C61 butyric acid methyl ester （P3HT：PCBM） organic pho- tovoltaic devices （OPVs） with an indium tin oxide （ITO） anode treated by a KMnO4 solution are investigated. The optimized KMnO4 solution has a concentration of 50 rag/L, and ITO is treated for 15 min. The modification of ITO anode results in an enhancement of the power conversion efficiency （PCE） of the device, which is responsible for the increase of the photocurrent. The performance enhancement is attributed to the work function modification of the ITO substrate through the strong oxygenation of KMnO4, and then the charge collection efficiency is improved.展开更多
基金Project supported bythe National Natural Science Foundation of China (60576016 ,10374001) Natural Science Foundationof Beijing (2073030) +1 种基金"973"National Key Basic Research Foundation of China (2003CB314707) National Natural Sci-ence Foundation of China (10434030)
文摘A novel rare earth complex Eu（TTA）2（N-HPA）Phen （TTA = thenoyltrifluoroacetone, N-HPA = N-phenylanthranilic acid, and phen = 1,10-phenathroline ）, which contains three different ligands, was synthesized. The Eu complex was blended with poly N-vinylcarbazole （PVK） in different weight ratios and spin coated into films. The luminescence properties of films were investigated and energy transfer between PVK and the complex was discussed. Multilayer structural devices consisting of ITO/PVK： Eu （TTA）2 （N-HPA） phen/BCP/Alq3/Al were fabricated with PVK ： Eu （TTA）2（N-HPA） as light-emitting layer. Increasing the concentration of Eu in the PVK thin film would inhibit the emission of PVK to different degrees. Finally, the pure red luminescence of europium（ Ⅲ ） was observed when the doping weight ratio was approximately 1 ： 5, which indicated an effective energy transfer from PVK to rare earth complex.
基金the National Natural Science Foundation of China under Grant Nos 10974013 and 60978060the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20090009110027+6 种基金Beijing Municipal Natural Science Foundation under Grant No 1102028the National Natural Science Foundation of China for Distinguished Young Scholar under Grant No 60825407Beijing Municipal Science and Technology Commission under Grant No Z090803044009001the National Basic Research Program of China under Grant No 2010CB327704the New Century Excellent Talents in University under Grant No NCET-10-0220the Fundamental Research Funds for the Central Universities under Grant No 2012JBZ001the Science and Technology Innovation Fund for Outstanding PhD Students of Beijing Jiaotong University under Grant No 48034。
文摘We prepare a tandem (OLED) with two independent units and three electrodes. One of the units consists of ITO/TPD/Al_(q3):DCJTB (5%)/LiF/Al/Au, and the other is Al/Au/TPD/Al_(q3)/LiF/Al. Two units sharing one transparent intermediate electrode Al/Au, together constitute the entire device. With the same current density, the voltage of the entire device is approximately equal to the sum of two units. The current efficiency of the entire device is several times higher than the sum up of two components. Without directly contacting an external power supply, the bi-metal intermediate electrode has the ability to produce electrons and holes for two adjacent emitting units, respectively. This kind of tandem device is characterized by controllable emission color and higher current efficiency than its two components added up.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10974013 and 60978060the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20090009110027+6 种基金Beijing Municipal Natural Science Foundation under Grant No 1102028the National Natural Science Foundation of China for Distinguished Young Scholar(No 60825407)Beijing Municipal Science and Technology Commission under Grant No Z090803044009001the National Basic Research Program of China under Grant No 2010CB327704the New Century Excellent Talents in University under Grant No NCET-10-0220the Fundamental Research Funds for the Central Universities under Grant No 2012JBZ001the Science and Technology Innovation Fund for Outstanding PhD Students of Beijing Jiaotong University(No 48034).
文摘In order to take advantage of organic and inorganic materials,we chose the polymer MEH-PPV as the luminous layer and ZnS as the electron transporting layer to prepare hybrid organic-inorganic light-emitting diodes(HOILEDs):ITO/MEH-PPV(~70 nm)/ZnS(20 nm)/Al by thermal evaporation and spin coating.Compared with the single-layer device ITO/MEH-PPV(~70 nm)/Al,spectral broadening and a slightly red shift are observed.Compared with the pure organic device ITO/MEH-PPV(~70 nm)/BCP(20 nm)/Al and combined with the energy level structure diagram,it is concluded that the spectral broadening and red shift are due to the exciplex luminescence at the interface between MEH-PPV and ZnS or BCP.In addition,the hybrid inorganic-organic device shows a lower turn-on voltage,but the current efficiency is lower than that of the pure organic device with the same structure.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10974013 and 60978060)the Research Fund for the Doctoral Program of Higher Education,China(Grant No.20090009110027)+3 种基金the Beijing Municipal Natural Science Foundation,China(Grant No.1102028)the New Century Excellent Talents in University,China(Grant No.NCET-10-0220)the Fundamental Research Funds for the Central Universities,China(Grant No.2012JBZ001)the Technology Innovation Fund for Outstanding Ph.D.Students of Beijing Jiaotong University,China(Grant No.48034)
文摘The properties of poly（3-hexylthiophene）：（6,6）-phenyl C61 butyric acid methyl ester （P3HT：PCBM） organic pho- tovoltaic devices （OPVs） with an indium tin oxide （ITO） anode treated by a KMnO4 solution are investigated. The optimized KMnO4 solution has a concentration of 50 rag/L, and ITO is treated for 15 min. The modification of ITO anode results in an enhancement of the power conversion efficiency （PCE） of the device, which is responsible for the increase of the photocurrent. The performance enhancement is attributed to the work function modification of the ITO substrate through the strong oxygenation of KMnO4, and then the charge collection efficiency is improved.
