Views: 1 Author: Site Editor Publish Time: 2025-05-29 Origin: Site
Recently, IMEC, a research and innovation center in Belgium, announced in its research paper the development of a new stacked structure for perovskite light-emitting diodes (PeLEDs), which have a brightness 1000 times higher than the most advanced organic light-emitting diodes (OLEDs) currently available.As part of the ULTRA-LUX project funded by the European Union, as described by the imec team in a news article in the Optics.org journal, this achievement is a key milestone towards perovskite injection lasers, with the potential to bring exciting applications in fields such as display, image projection, environmental sensing, and medical diagnosis in the future.
From televisions and computers to traffic signals and aviation lighting, light-emitting diodes have been widely used, completely revolutionizing modern lighting and sensing technology. On the other hand, organic light-emitting diodes (OLEDs), as one of the most popular display technologies nowadays, are also widely used in the manufacturing of digital displays for television screens, computer monitors, smartphones, and handheld game consoles, using organic thin film polymers as semiconductor devices.However, due to objective factors such as luminescent materials, their peak brightness is limited. Think about it, how difficult it is to read the content on the OLED screen of your smartphone when you are in the sunlight.
This is exactly where perovskite luminescent materials come into play. Perovskite is a type of perovskite oxide with a cubic crystal structure, and its unusual physical properties make it possible to be applied in fields other than solar cells (which are currently its main application area). In the past decade, perovskite has gradually become a highly anticipated candidate material in the field of light-emitting diode applications due to its excellent optoelectronic properties, low-cost processability, and efficient charge transfer capability.
The highly anticipated perovskite light-emitting diode (PeLED)
However, as explained in this news, perovskites may be able to withstand relatively high current densities, but laser operations that emit high-intensity coherent light have not yet been achieved. Professor Paul Herrmann, Senior Researcher at IMEC and corresponding author of the research paper published in Nature Photonics, stated that "in the ULTRA-LUX project, IMEC has demonstrated for the first time a perovskite light-emitting diode (PeLED) architecture with low optical loss, and driven these PeLEDs to a current density that can support stimulated emission of light. In addition, Professor Herremans added, "This new architecture consisting of a transport layer, transparent electrodes, and perovskite as a semiconductor active material can operate at tens of thousands of times higher current densities (3 kiloamperes per square centimeter) than traditional OLEDs
So, what achievements has this new architecture made? IMEC project manager Robert Gerhal, who is also the corresponding author of this study, explained: 'Through this architecture, IMEC enhances amplified spontaneous emission with the electrical assistance of traditional optical pumping.'. Through this method, IMEC has demonstrated that the contribution of electrical injection to the total stimulated emission reaches 13%, thus approaching the threshold for implementing thin-film injection lasers. This milestone breakthrough towards high-power thin-film laser diodes paves the way for exciting new applications of thin-film perovskite lasers.
