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Continuous triplet accumulation over 1 wt.% in a host-guest crystalline material showing bright green afterglow emission is achieved due to suppressed Förster resonance energy transfer for accumulated triplet excitons under strong excitation. The medium, as well as a common green afterglow emitter, exhibits a promising irradiance-induced appearance for high-resolution afterglow imaging, providing novel anticounterfeiting capabilities. Abstract Afterglow room-temperature emission that is independent of autofluorescence after ceasing excitation is a promising technology for state-of-the-art bioimaging and security devices. However, the low brightness of the afterglow emission is a current limitation for using such materials in a variety of applications. Herein, the continuous formation of condensed triplet excitons for brighter afterglow room-temperature phosphorescence is reported. ( S )-(-)-2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl (( S )-BINAP) incorporated in a crystalline host lattice showed bright green afterglow room-temperature phosphorescence under strong excitation. The small triplet–triplet absorption cross-section of ( S )-BINAP in the whole range of visible wavelengths greatly suppressed the deactivation caused by Förster resonance energy transfer from excited states of ( S )-BINAP to the accumulated triplet excitons of ( S )-BINAP under strong continuous excitation. The steady–state concentration of the triplet excitons for ( S )-BINAP reached 2.3 × 10 −2  M, producing a bright afterglow. Owing to the brighter afterglow, afterglow detection using individual particles with sizes approaching the diffraction limit in aqueous conditions and irradiance-dependent anticounterfeiting can be achieved.