# e-ILV

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# 17-21-101

βL,λ(μ)

quotient of the radiance per unit emission bandpass, dλ, at a specified emission wavelength, λ, due to photoluminescence from the specimen when irradiated at a specified excitation wavelength, μ, and the radiance of the perfect reflecting diffuser identically irradiated and viewed

Note 1 to entry: Spectral quantities with a subscript λ in their designation indicate differential spectral radiometric quantities.

Note 2 to entry: When integrated or summed over the spectral bandpass of the instrument, this quantity becomes the bandpass-weighted bispectral luminescent radiance factor, βL,λ(μ) Δλ.

Note 3 to entry: The complete tabular form of bispectral luminescent radiance factor and reflected radiance factor data is the Donaldson matrix representation of bispectral radiance factor, D(μλ). The excitation wavelengths, μ, are tabulated in the vertical direction, the emission wavelengths, λ, in the horizontal direction, the reflected radiance factors, βR(λ), appear on the diagonal where the excitation and emission (detection) wavelengths are equal, and the array of bandpass-weighted bispectral luminescent radiance factor data, βL,λ(μ) Δλ, appear on the off-diagonals.

Note 4 to entry: The bispectral luminescent radiance factor is expressed in nanometre to the power minus one (nm−1).

Note 5 to entry: This entry was numbered 17-91 in CIE S 017:2011.

Publication date: 2020-12