Example 18

Evaluation on Basic Properties of Compound (1-1-1)

[Absorption Properties]

An absorption spectrum was measured by preparing a 2.0×10−5 mol/L toluene solution of a compound (1-1-1) and measuring the absorption spectrum of the solution. As a result, the maximum absorption wavelength in a visible light region was 477 nm (FIG. 3).

[Light Emission Properties]

The fluorescence spectrum was measured by preparing a 2.0×10−5 mol/L toluene solution of a compound (1-1-1), which was used in the absorption spectrum, exciting the solution at an excitation wavelength of 365 nm at room temperature, and observing a fluorescence spectrum thereof. As a result, the maximum light emission wavelength was 483 nm, and the half width was 13 nm (FIG. 4). The fluorescence quantum yield in this example was 100%. Furthermore, the lifetime of a delayed fluorescence component was measured using a fluorescence lifetime measurement device and found to be 1.0 μsec. Note that, in the fluorescence lifetime measurement, fluorescence having a light emission lifetime of 100 ns or shorter was determined as instant fluorescence and fluorescence having a lifetime of 0.1 μs or longer was determined as delayed fluorescence, and data of 3.0 to 6.2 μsec was used for calculation of a fluorescence lifetime (FIG. 5).

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