Apart from direct phosphorescence, where the analyte is excited by light of an appropriate wavelength and phosphoresces itself, several indirect phosphorescence modes can be distinguished.
C1 C11, upon excitation at 390 nm in acetonitrile at 298 K, phosphoresces with λ max ∼ 570 600 nm with phosphorescence quantum yield (Φ PL) and emission lifetime (τ e) in the range of 5.40 41.21% and 8.60 17.72 μs respectively (Table S1 and Fig. S5 †).
The resulting molecular oxygen singlet state phosphoresces in the far red and the near infrared.
However, barium sulfate phosphoresces.
PtG4 phosphoresces at room temperature in deoxygenated aqueous solutions with quantum yield of 0.07 (measured against fluorescence of Rhodamine 6G in ethanol, 0.94).
Brand reported his discovery in a letter to Gottfried Wilhelm Leibniz, and, thereafter, demonstrations of this element and its ability to glow in the dark, or "phosphoresce," excited public interest.
This unusual book explores such topics as why animals in the Far North tend to be big; how wool and Gore-Tex keep a person warm; the invention of air-conditioners; and scientists' attempts to reach absolute zero (it turned out to be impossible, but along the way "rubber, ivory, feathers and sponges phosphoresced with their own bluish glow").
However, there is hope in some tracks, with Radioland phosphorescing gently in clouds of gentle reverb.
They looked a little aqueous, as if they were phosphorescing in a liquid darkness.
The phosphors in the paint are excited and eventually reach their T1 states, from which they can phosphoresce and be observed.
