Symbol	Unit	Meaning
E ex		Fluorescence excitation quantum distribution
E′ ex	cm−1	Normalized fluorescence excitation quantum distribution
E F	nm−1	Fluorescence emission quantum distribtion
I	W cm−2	Intensity
I exc	W cm−2	Excitation intensity
N	cm−3	Number density
g LED xxx nm		Spectral light distribution of LED xxx nm
n ph	cm−3	Photon number density
t	fs, ps, ns, s, min, h, d	Time
t exc	S	Exposure time
w sat	J cm−2	Saturation energy density
Δ		Difference
α	cm−1	Attenuation coefficent
αa	cm−1	Absorption coefficent
αs	cm−1	Scattering coefficient
γ		Empirical scattering exponent
δ		Difference
ϑ	°C	Temperature
κ		Mole fraction
λ	Nm	Wavelength
λexc	Nm	Excitation wavelength
λF	Nm	Fluorescence emission wavelength
λF,exc	Nm	Fluorescence excitation wavelength
λpr	Nm	Probe wavelength
ν	Hz	Frequency
$\tilde{\nu }$	cm−1	Wavenumber
σ	cm2	Absorption cross-section
τF	ps, ns	Fluorescence lifetime
τrec	min, h	Recovery time constant
τrel	S	Relaxation time constant
τsat	S	Saturation time constant
ϕ		Quantum yield
ϕcon		Quantum yield of photoconversion
ϕF		Fluorescence quantum yield
ϕiso		Quantum yield of photoisomerization
ϕtherm		Quantum yielf of thermal conversion