Fluorescence spectra and quantum yields. Quinine, uranine, 9,10-diphenylanthracene, and 9,10-bis(phenylethynyl)anthracenes

Heterocyclic Quinol‐Type Fluorophores: Synthesis, X‐ray Crystal Structures, and Solid‐State Photophysical Properties of Novel 5‐Hydroxy‐5‐substituent‐benzo[b]naphtho[1,2‐d]furan‐6‐one and 3‐Hydroxy‐3‐substituent‐benzo[kl]xanthen‐2‐one Derivatives

“…The solid-state fluorescence excitation and emission spectra of the crystals was recorded with a JASCO FP-777 spectrometer equipped with a JASCO FP-1060 attachment. The fluorescence quantum yields (F) were determined by the use of 9,10-bis(phenylethynyl)anthracene (F = 0.84, l ex = 440 nm) [14] in benzene as the standard. Elemental analyses were recorded on a Perkin Elmer 2400 II CHN analyzer.…”

Solid‐State Fluorescence Changes of 2‐(4‐Cyanophenyl)‐5‐[4‐(diethylamino)phenyl]‐3H‐imidazo[4,5‐a]naphthalene upon Inclusion of Organic Solvent Molecules

“…Absorption spectra were observed with a JASCO Ubest30 spectrophotometer and fluorescence spectra were measured with a JASCO FP-777 spectrophotometer. The fluorescence quantum yields (Φ) in benzene were determined by using 9,10-diphenylanthracene (Φ = 0.67, λ ex = 357 nm) [15] in benzene as the standard. The solid-state fluorescence quantum yields (Φ) were determined by using a calibrated integrating sphere system (λ ex = 325 nm).…”

Solid-emissive fluorophores constructed by a non-planar heteropolycyclic structure with bulky substituents: synthesis and X-ray crystal structures

“…The samples were exited by a laser diode 265 (λ ex = 375 nm). The fluorescence quantum yields (Φ f ) were determined using 9,10-bisphenylethynylanthracene (Φ f = 0.84, λ ex = 440 nm) 15 in benzene as the standard. The solidfluorescence quantum yields (Φ f ) were determined by using a calibrated integrating sphere system (λ ex = 325 nm).…”