Abstract:
Light emitting devices comprising a transparent substrate, a reflective layer on the substrate having at least one opening therein, a waveguiding layer on said reflective layer, and at least one OLED on the waveguiding layer for emitting light of a predetermined color. The light emitted from each OLED is directed through the at least one opening in the reflective layer for emission through the substrate.
Abstract:
An optically-pumped laser having a small-molecule thin organic film of DCM doped Alq.sub.3. Carrier transport properties of the small-molecule organic materials, combined with a low lasing threshold provide a new generation of diode lasers employing organic thin films. An electrically-pumped variant is also described.
Abstract:
Disclosed herein are novel dopant compounds of Formula I below, wherein those compounds are used in organic light emitting devices (OLED's) for device elements capable of emitting light of wavelengths associated with saturated red emissions. ##STR1## Also disclosed are OLED's utilizing device elements comprising the above compounds and display devices based on those OLED's.
Abstract:
Film spectral properties are measured by projecting chopped monochromatic light onto a luminescent film sample deposited on a substrate, and coupling through use of immersion oil the reflection of light therefrom to a light detector.
Abstract:
A patterning system with a photoresist overhang allows material to be deposited onto a substrate in various positions by varying the angle from which the material is deposited, and by rotating the substrate. The patterning system can be used to fabricate a stack of organic light emitting devices on a substrate using the same patterning system and without removing the substrate from vacuum.
Abstract:
Optical cavities in a stacked organic light emitting device (SOLEDS) can shift or attenuate the light emitted by the individual organic light emitting devices (OLEDs) in the stack. Interference caused by reflections within the stack, absorption, positioning of the light source, and the polarization of the emitted light can all determine how the spectra of the emitted light are affected by the SOLED structure. A detailed model that provides a good fit to measured SOLED emissions can be used to predict how a SOLED will affect light emitted by OLEDs. As a result, SOLED geometries that will optimize color saturation and external quantum efficiency can be predicted.
Abstract:
An organic light emitting device (OLED) structure having reflective surfaces is fabricated in a pit formed in a substrate. The pit has slanted reflective side walls which redirect light that is waveguided in the organic layers of the OLED to a direction substantially normal to the plane of the substrate. The reflective structure can also be formed with a planar configuration over interconnects covered with a polyimide.
Abstract:
Arrangements for biasing the individual light emitting elements of a stacked organic light emitting device (SOLED). A circuit is provided for independently driving the individual OLEDs in a conventional SOLED having one electrode coupled to ground potential and one further electrode for each of the OLEDs in the stack. Additionally, new SOLED structures are described in which each OLED in the stack is provided with a ground reference. A SOLED combining upright and inverted OLEDs is also described.
Abstract:
Organic optoelectronic devices, such as a modulator (54) and a photodetector (73) comprising alternating layers (58) of two crystalline planar organic aromatic semiconductors (60 and 62), have been grown by organic molecular beam deposition. These organic substances have been deposited in ultra-thin layers only 10 .ANG. in depth using organic molecular beam deposition methods. Due to the anisotropic character of these organic materials,, the devices formed using these methods possess unique electronic and optical properties. The preferred embodiment of the invention utilizes 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) and 3,4,7,8-naphthalenetetracarboxylic dianhydride (NTCDA). While the inventors have identified PTCDA and NTCDA as excellent materials for the manufacture of organic optoelectronic IC devices, the broad scope of the present invention encompasses the use of any planar organic aromatic semiconductor which readily forms a crystalline structure. The preferred method of the invention employs a chamber (23) containing an inorganic substrate (32) with appropriate material for making electrical contact to the organic structures and sources of PTCDA (36) and NTCDA (38). The chamber (23) is maintained at a pressure which is generally less than 10.sup. -6 Torr. The substrate (32) is separated from the source materials by a minimum separation distance of 10 cm. The substrate (32) is held below 150K while the PTCDA and NTCDA are alternately heated. The methods described above may also be employed to fabricate an organic phototransistor/photodetector (78).
Abstract:
A high speed opto-electronic crossbar switch 10 disposed to selectively connect signals carried by first and second input optical beams to an output node 42. The inventive switch 10 includes a selectively actuatable photodetector network 22 for converting the signals carried by the first and second input beams to electrical output signals, and for impressing these output signals upon the output node 42. The photodetector network 22 has a first photodetector 30 in optical alignment with the first input beam, and a second photodetector 32 in optical alignment with the second input beam. The inventive crossbar switch 10 further includes a multiplexer 26 for actuating the first and second photodetectors 30, 32 in response to a control signal. The invention also includes a laser diode circuit 24 for illuminating the first and second photodetectors 30, 32 in response to the control signal.