Table 1 Photophysical parameters for photoluminescence in crystals at RT by excitation at 280 nm^a.

^aλ_max^lum maximum RTP wavelength, Φ RTP quantum yield, τ RTP lifetime.
^bCrystals with a size of >100 µm obtained by recrystallisation from CH₂Cl₂/acetone.
^cEstimated by integration in the wavelength range from 350 to 450 nm for the DT4 minor band, from 450 to 875 nm for the DT4 major band, from 350 to 500 nm for the DT5 major band, from 500 to 875 nm for the DT5 minor band, and from 350 to 875 nm for DT6.
^dThe τ in bulk crystals was measured at 390 nm for DT4 minor band, 615 nm for DT4 major band, 405 nm for DT5 major band, 605 nm for DT5 minor band, and 700 nm for DT6, respectively. The pre-exponential factors are indicated in the parentheses, and the negative factor means rise of the luminescence.
^eCrystals with a size of ~100 nm obtained by reprecipitation from THF/water, and the measurements were performed on a filter.
^fEstimated by integration in the wavelength range from 500 to 850 nm.
^gMeasured at 700 nm.
^hNormalised RTP quantum yield⁴⁷.

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