Fig. 3: Photoluminescence of narrow-band Eu(II)-based perovskitoids.
From: Suppressing electron–phonon coupling for narrow-band emitting Eu(II)-based perovskitoids
a Normalized PL spectra at room temperature. b PL internal/external quantum efficiency (ФIQE/ФEQE) and absorption efficiency (Abs), (the error bar, ±5%, from three measurements). c Temperature-dependent emission intensity with temperature range of 20–120 °C. d The time-resolved photoluminescence of TEtEuBr3, MeEtEuBr3, ByEtEuBr3, EmimEuBr3, Pmim2EuBr4 under 340 nm pulse laser diode excitation, where the x-axis is the PL decay time of each emission wavelength, y-axis is emission wavelength with spacing of 10 nm, the depth of color represents PL intensity (color bar, 10−3–103 arb.u.). e The FWHM of as-prepared Eu(II)-based perovskitoids by summarizing average values of 15 samples. f The full width at half maximum (FWHM) of as-prepared Eu(II)-based perovskitoids under variable excitation wavelengths (300–450 nm), frequencies (0.2–20 MHz) and power (5–100 mW) with 375 nm laser, (the error bar, ±3 nm, from five samples).
