2,5-Diphenyloxazole (PPO) is an organic scintillator.[2] 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.

2,5-Diphenyloxazole
Names
Preferred IUPAC name
2,5-Diphenyl-1,3-oxazole
Other names
PPO, DPO, POP
Identifiers
ChemSpider
ECHA InfoCard 100.001.984 Edit this at Wikidata
EC Number
  • 202-181-3
UNII
Properties
C15H11NO
Molar mass 221.259 g·mol−1
Appearance greenish powder
Density 1.094 g/cm3 (100 °C)[1]
Melting point 71 °C (160 °F; 344 K)[1]
Boiling point 360 °C (680 °F; 633 K)[1]
1.6231 (100 °C)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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References

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  1. ^ a b c d Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. p. 3.232. ISBN 9781498754293.
  2. ^ Bertrand, Guillaume H. V.; Hamel, Matthieu; Sguerra, Fabien (2014). "Current Status on Plastic Scintillators Modifications". Chemistry - A European Journal. 20 (48): 15660–15685. doi:10.1002/chem.201404093. PMID 25335882.