The Ames Laboratory of the US 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 Ahnar, a laboratory scientist at Ames, said: "What we really want to achieve is to create a spectrometer that can measure the amount of light or luminescence spectrum absorbed by all luminescent or 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 growing demand for OLEDs for small-sized, flexible device analyzers that could be used to detect food Safety, water quality, medical diagnostics, and other biological sensing. "Such device features include being hand-held, being used in a variety of different areas, and the potential to be discounted to disposable." 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 the UV OLED 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 . Graduate student Eeshita Manna experimented with the scientist Rana Biswas exciting the spectrum. Incorporating photopolymer successfully expands UV OLED photo-excitation wavelength range Following a previous study by Emily Hellerich, a graduate student in the lab, this time researchers expanded the range to 470 nanometers 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.