Recently, valence technology and raw material supplier Novaled announced the development of a high-power-efficient fluorescent white OLED architecture - illuminance of up to 36lm / W. In addition, Novaled also uses patented organic materials and a new planar light extraction method to increase the brightness of OLED devices by more than 80%, providing good color rendering and improving the angular dependence of light exposure.
According to Novaled, the newly released power-saving fluorescent white PIN OLED technology reduces manufacturing costs and meets commercial lighting application standards, making it ideal for OLED lamps and fixtures designed for general and design lighting applications.
Novaled CEO Gildas Sorin said: “So far, typical light extraction methods have been somewhat inefficient and may have led to higher manufacturing costs. Novaled has overcome two major challenges – innovative ways to significantly improve light extraction results; Quantum efficiency has increased by more than 80%, but without the high cost and time-consuming drawbacks of traditional complex manufacturing processes.
Novaled's innovative approach enhances the benefits of light extraction, resulting in a significant 25-35% increase in light, allowing OLED devices to be used in lighting. These methods also increase the power efficiency and quantum efficiency of the bottom and top-emitting OLEDs. In terms of bottom-emitting OLEDs, Novaled incorporated NET61 directly into the electron transport layer. NET61 internal light extraction combined with an external microlens array (MLA) film increases power efficiency by more than 70% and quantum efficiency by more than 80%. For top-emitting OLEDs, Novaled uses the scattering material NLE17 on the top of the translucent upper electrode to help extract light and improve the light quality of the top-emitting white OLED device.
Novaled's new light extraction technology uses a standard program to create a white light PIN OLED device architecture, thus reducing the manufacturing cost of bottom-emitting and top-emitting OLEDs. Unlike other bottom-emitting OLEDs, the light extraction enhancement method—such as placing a complex structural layer between the substrate glass and the indium tin oxide (ITO) anode—novaled uses simple internal light extraction and vacuum evaporation of organic materials. Induces light from the OLED to scatter. In bottom and top-emitting OLEDs, the scattering does not adversely affect electrical properties.
In addition, Novaled developed a new method to improve the color rendering index (CRI) of top-emitting OLEDs on metal substrates. Although the top-emitting sample on a white metal substrate generally produces a cavity effect that is stronger than the bottom-emitting device and has a larger viewing angle change, Novaled improves the light extraction capability of the top-emitting white OLEDs, and The use of a translucent upper electrode tip through the organic layer of the scattering evaporation process greatly reduces the angular color dependence. Novaled's top-emitting OLEDs have a CRI value of 75, which is sufficient for most commercial lighting applications.
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