| Yellowish powder|
2,5-Diphenyloxazole (PPO) is an organic scintillator. It is used as a wavelength shifter (also called a "primary shifter" or "fluor"), which means that it converts shorter wavelength light to longer wavelength light. Its output spectrum peaks at 385 nm, which is in the range of UV light.
The properties of PPO were measured by Cosmic Rays and Particle group at Nazarbayev University. The PPO was dissolved in 1,2,4-trimethylbenzene (PC or pseudocumene) and tested using the Agilent Cary Eclipse spectrophotometer. This is part of the on-going work and once its published, the reference will be provided. Right now, raw plots with watermark are being uploaded so that there is any data available.
The PPO fluorescence is being excited using wavelength from 190 nm to 370 nm. Fluorescence is monitored at 385 nm.
The fluorescence spectrum is shown. The PPO being excited at 280 nm (first peak). Can clearly observe the emission peak at 385 nm.