摘要:
An organic light emitting device includes a substrate, an anode and a cathode disposed over the substrate; a luminescent layer disposed between the anode and the cathode wherein the luminescent layer includes a host and at least one dopant; the host of the luminescent layer being selected to include a solid organic material comprising a mixture of at least two components wherein the first component of the mixture is an organic compound that is capable of transporting both electrons and holes and that is substantially non-polar; and the second component of the mixture is an organic compound that is more polar than the first component; and the dopant of the luminescent layer being selected to produce light from the light emitting device.
摘要:
A photovoltaic element featuring a photoconductive composition comprising an electrically insulating binder, an organic dye, and an organic photoconductor is disclosed. The photovoltaic element has superior conversion efficiencies compared to other organic photovoltaic elements.
摘要:
Disclosed is a photoreceptor comprising at least one substantially non-charge-injecting contact in a charge-collecting relationship with a solid phase consisting essentially of a compound having the general formula ##STR1## where each R is independently selected from hydrogen, alkyl from C.sub.1 to C.sub.8, aryl from C.sub.6 to C.sub.14, one or more fused benzene rings formed by adjacent R groups, halogen, cyano, and alkoxy from C.sub.1 to C.sub.8, each X is independently selected from S and O, and R.sub.1 is a conjugated bridging group. Also disclosed is a method of making that photoreceptor.
摘要:
Disclosed is an electroluminescent device comprising a cathode and an anode and, located therebetween, a light-emitting layer (LEL) comprising a phosphorescent guest material, a hole- and electron-transporting host material, and an efficiency-enhancing material having an ionization potential lower than that of the host material and a triplet energy level that is lower than that of the phosphorescent guest material by no more than 0.2 eV. Such a device provides useful light emission features.
摘要:
The present invention relates to a multi-active electrophotographic element having a charge-transport layer containing stable free radical compounds as the charge-transport material. A process of forming images with this element is also disclosed.
摘要:
An OLED includes an anode, a light-emitting layer disposed over the anode, and a first electron-injecting layer disposed over the light-emitting layer, wherein the first electron-injecting layer includes at least one organic host material having a reduction potential less than −1.0 V vs. a Saturated Calomel Electrode and at least one dopant material capable of reducing the organic host material. The OLED also includes a second electron-injecting layer disposed in contact with the first electron-injecting layer, wherein the second electron-injecting layer includes at least one organic material having a reduction potential greater than −1.0 V vs. a Saturated Calomel Electrode, and a cathode disposed over the second electron-injecting layer.
摘要:
A method of adjusting the voltage applied across the pixels of an OLED display to compensate for aging including measuring the accumulation of trapped positive charge to produce a signal representative of such accumulation, and responding to such signal to adjust the voltages applied across the pixels of the OLED to compensate for aging.
摘要:
An organic electroluminescent device includes a substrate; an anode and a cathode positioned relative to the substrate; an emission layer disposed between the anode and the cathode; a hole-transport layer disposed between the anode and the emission layer; and an electron-transport layer disposed between the cathode and the emission layer. The hole-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. Alternatively or in addition, the electron-transport layer includes two or more sublayers, one sublayer containing a stabilizing dopant, and the sublayer adjacent to the emission layer containing no stabilizing dopant. The stabilizing dopant includes rubrene or derivatives thereof.
摘要:
Certain chemical compounds, which are aromatic heterocyclic-substituted derivatives of 4H-thiopyran-1,1-dioxide, are electron-transport agents. These compounds exhibit good speed and toe voltage properties in electrophotographic elements.
摘要:
Photoconductive elements which have high sensitivity to radiation in the near-infrared region of the electromagnetic spectrum comprise a conductive support, a charge generation material which includes a near-infrared-sensitive organic pigment and, electrically contiguous with the charge generation material, an aggregate photoconductive material. A preferred embodiment is bimodal.