9 10-bis(phenylethynyl)anthracene wavelength July 8, 2019 16 32 64 128 9 10-bis(phenylethynyl)anthracene 9 10-bis(phenylethynyl)anthracene synthesis 9 10-diphenylanthracene quantum yield 9 10-diphenylanthracene 9 10-diphenylanthracene fluorescence