The Ames Laboratory of the U.S. Department of Energy (DOE) has developed a fully ultraviolet (UV) -based organic light-emitting diode (OLED) that can be used as a wafer-based sensor.
It's a first-of-a-kind research where scientists operate invisible light in special areas, with wavelengths in the ultraviolet range of about 400 nanometers (nm).
Joseph Shinar, Ames lab scientist, said: "What we really want to achieve is to create a spectrometer that can measure the amount of light or luminescence spectra that are absorbed by all luminescent or light-absorbing objects."
Many people have long been interested in OLEDs. Mostly, whether this technology can become a traditional LED replacement technology and LED is widely used in consumer electronic products has little research on OLED and UV spectra. Ruth Shinar, a laboratory scientist, explains: "Because of this, everyone ignored the emerging need for OLEDs for small-sized, flexible device analyzers that can be used to detect food safety , Water quality, medical diagnostics, and other biological sensing. "Such device features include the ability to be handheld, used in a variety of different areas, and cost-effective to throw away."
Researchers snatched their clues to explore the impact of optical micro-cavity, the micro-cavity is the reflection of the surface or the structure of the two interfaces. A tiny resonator changes the wavelength behavior of light. These features allow UVOLED to emit more focused light, which can then be used to detect and excite the spectrum. With this OLED array, different analyzes and photo-excitation can be performed on the same device.
According to the OLED microresonator study conducted by Ames Laboratories, the researchers produced a light that emits light at wavelengths between 370 and 430 nanometers with dark blue and near-ultraviolet light, a fact that continues the results of previous scientists . The graduate student Eeshita Manna experimented with the scientist Rana Biswas excitation spectrum.
The successful development of UVOLED photo-excitation wavelength range with photopolymer
Undertaking a study by Emily Hellerich, a former graduate student in the lab, this time, researchers expanded the range to 470 nanometers by using unique photopolymer materials CBP and PVK. Before further integration of the research on visible OLED array resonators, scientists were able to obtain a wavelength range of 370 nm to 640 nm.
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