Cambridge Display Technology Limited

System Control Technologies Limited

William Young

Euan Christopher Smith

Matthew Roberts

Clare Foden

Nalinkumar Lallubhai Patel

Colin Baker

John Michael Walls

Desmond Gibson

Adam Strevens

Philip Benzie

Nicoletta Anathassopoulou

An organic light emitting device which emits white light in use, comprising a reflective anode (), a first light emitting layer () which emits red light located over said anode, a second light emitting layer () which emits blue light and green light located over said first light emitting layer, and a cathode structure located over said second light emitting layer comprising a first semi-reflecting layer () and a second semi-reflecting layer () with a layer () of light transmissive material between the first and second semi-reflecting semi-transparent layers, the distance between the reflective anode () and the first semi-reflecting semi-transparent layer () being selected to form a micro-cavity which enhances blue light emission and red light emission from the device, and the distance between the reflective anode () and the second semi-reflecting semi-transparent layer () being selected to enhance green light emission from the device.

Organic light emitting device which emits white light

An organic light emissive device comprising: a first electrode; a second electrode; and an organic light emissive region between the first and second electrodes comprising an organic light emissive material which has a peak emission wavelength, wherein at least one of the electrodes is transparent and comprises a composite of a charge injecting metal and another material which is codepositable with the charge injecting metal, the other material having a different refractive index to that of the charge injecting metal and wherein the other material has a lower degree of quenching at the peak emission wavelength than the charge injecting metal whereby quenching of excitons by the at least one electrode is reduced, the charge injecting metal comprising either a low work function metal having a work function of no more than 3.5 eV or a high work function metal having a work function of no less than 4.5 eV.

Light emissive device having cathode comprising a codeposited mixed layer

The invention relates to a method and apparatus for the application of material to form a layer of an organic electroluminescent device. The material is sputter deposited typically from at least one target of material held in respect to a magnetron in a coating chamber. The magnetrons used can be unbalanced magnetrons and/or are provided with other magnetrons and/or magnet arrays in a closed field configuration. The material is found to be deposited in a manner which prevents or minimises damage to the device and hence reduces or removes the need for a barrier layer to be applied.

Apparatus and method for the application of a material layer to display devices

Light emissive device having electrode comprising a metal and a material which is codepositable with the metal

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Cambridge, United Kingdom

William Young