The effect of dipole layer of Alq3 and metal on organic electroluminescence in organic light-emitting diodes(OLEDs) was discussed. The relations among energy level alignment,interface charge transfer and dipole layer ...The effect of dipole layer of Alq3 and metal on organic electroluminescence in organic light-emitting diodes(OLEDs) was discussed. The relations among energy level alignment,interface charge transfer and dipole layer formation were well analyzed. An interface dipole layer and charge transfer were observed by XPS and UPS. As for Alq3 with metallic film such as Al and Mg,N 1s,O 1s and C 1s all move to low binding energy. Both Alq3/Al and Alq3/Mg have different electron spectrum from that of simple Alq3 film. It is really the reason of the interface energy change that the metal atoms located near the interface move to organic layer and then chemically interact with O and C of Alq3. The injection voltage barrier heights of electrons at Alq3/Al and Alq3/Mg interface are 0.1 eV and 0.2 eV,respectively. Charge transfer lowers electrons injection voltage barrier height and forms good electrons injection interfaces. The width of dipole layer is about 5 nm. The knowledge of such interface dipole layer is essential for a proper understanding of the physical processes at the metal/organic interface.展开更多
Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell we...Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell were measured. Meanwhile the fluorescent spectra, excited spectra and absorption spectra of Znq 2 with powder and film states were also measured.展开更多
Several organic electroluminescent (EL) com-pounds,2,2′-(1,4-phenylenedivinylene)bis-3,3-dimethyl-in- dolenine (1),2,2′-(1,4-phenylenedivinylene)bis-benzoxazole (2), 2,2′-(1,4-phenylenedivinylene)bis-benzothiazole ...Several organic electroluminescent (EL) com-pounds,2,2′-(1,4-phenylenedivinylene)bis-3,3-dimethyl-in- dolenine (1),2,2′-(1,4-phenylenedivinylene)bis-benzoxazole (2), 2,2′-(1,4-phenylenedivinylene)bis-benzothiazole (3), 4,4′-(1,4-phenylenedivinylene)bis-quinoline (4),2,2′-(1,4-phenyle-nedivinylene)bis-quinoline (5),2,2′-(1,4-phenylenedivinyle-ne)bis-1,3,3-trimethyl-indoleninedichloride(6),2,2′-(1,4- phenylene-divinylene)bis-1-hydro-3,3-dimethylindolenine dichloride (7),2,2′-(1,4-phenylenedivinylene)bis-8-acetoxy- quinoline (8), 2,2′-(1,4-phenylenedivinylene)bis-8-hydroxyq- uinoline (9) and metal complexes of 9, Al(PHQ) (10) and Zn(PHQ) (11), have been synthesized and characterized. The crystal structure of 6 was determined. Light emitting proper-ties of the prepared compounds have been investigated. 1 produces an orange-yellow emission (lmax = 575 nm). The cation, 6, gives a red emission (lmax = 607 nm), which is shifted 32 nm to the red compared to 1. 8 produces a yellow emission (lmax = 567 nm). The metal complex 10 gives a red emission (lmax = 610 nm), which is a red shift of 43 nm com-pared to 8. The change in structure in the prepared com-pound caused a change in the electron distribution in the compounds, which induces a large wavelength shift of the emitted-light. Thermal analysis showed that the decomposi-tion temperatures of the metal complexes (10, 11) were higher than those for the smaller organic molecular com-pounds (1-9). Therefore, metal complexes (10, 11) can be used as EL materials over a larger temperature range.展开更多
基金Project(06JJ20034) supported by the Natural Science Foundation of Hunan Province, ChinaProject supported by the Theory Science Development Foundation of Central South University, China
文摘The effect of dipole layer of Alq3 and metal on organic electroluminescence in organic light-emitting diodes(OLEDs) was discussed. The relations among energy level alignment,interface charge transfer and dipole layer formation were well analyzed. An interface dipole layer and charge transfer were observed by XPS and UPS. As for Alq3 with metallic film such as Al and Mg,N 1s,O 1s and C 1s all move to low binding energy. Both Alq3/Al and Alq3/Mg have different electron spectrum from that of simple Alq3 film. It is really the reason of the interface energy change that the metal atoms located near the interface move to organic layer and then chemically interact with O and C of Alq3. The injection voltage barrier heights of electrons at Alq3/Al and Alq3/Mg interface are 0.1 eV and 0.2 eV,respectively. Charge transfer lowers electrons injection voltage barrier height and forms good electrons injection interfaces. The width of dipole layer is about 5 nm. The knowledge of such interface dipole layer is essential for a proper understanding of the physical processes at the metal/organic interface.
文摘Organic electroluminescent thin film using Znq 2 (Znq 2) as the emitting layer material with structure of glass/ITO/Znq 2/Al (cell)was fabricated. The V I curve, V B curve and electroluminescent spectra of the cell were measured. Meanwhile the fluorescent spectra, excited spectra and absorption spectra of Znq 2 with powder and film states were also measured.
文摘Several organic electroluminescent (EL) com-pounds,2,2′-(1,4-phenylenedivinylene)bis-3,3-dimethyl-in- dolenine (1),2,2′-(1,4-phenylenedivinylene)bis-benzoxazole (2), 2,2′-(1,4-phenylenedivinylene)bis-benzothiazole (3), 4,4′-(1,4-phenylenedivinylene)bis-quinoline (4),2,2′-(1,4-phenyle-nedivinylene)bis-quinoline (5),2,2′-(1,4-phenylenedivinyle-ne)bis-1,3,3-trimethyl-indoleninedichloride(6),2,2′-(1,4- phenylene-divinylene)bis-1-hydro-3,3-dimethylindolenine dichloride (7),2,2′-(1,4-phenylenedivinylene)bis-8-acetoxy- quinoline (8), 2,2′-(1,4-phenylenedivinylene)bis-8-hydroxyq- uinoline (9) and metal complexes of 9, Al(PHQ) (10) and Zn(PHQ) (11), have been synthesized and characterized. The crystal structure of 6 was determined. Light emitting proper-ties of the prepared compounds have been investigated. 1 produces an orange-yellow emission (lmax = 575 nm). The cation, 6, gives a red emission (lmax = 607 nm), which is shifted 32 nm to the red compared to 1. 8 produces a yellow emission (lmax = 567 nm). The metal complex 10 gives a red emission (lmax = 610 nm), which is a red shift of 43 nm com-pared to 8. The change in structure in the prepared com-pound caused a change in the electron distribution in the compounds, which induces a large wavelength shift of the emitted-light. Thermal analysis showed that the decomposi-tion temperatures of the metal complexes (10, 11) were higher than those for the smaller organic molecular com-pounds (1-9). Therefore, metal complexes (10, 11) can be used as EL materials over a larger temperature range.
