Chang-Cun Yan, Zong-Lu Che, Wan-Ying Yang, Xue-Dong Wang, Liang-Sheng Liao. Deep-red and near-infrared organic lasers based on centrosymmetric molecules with excited-state intramolecular double proton transfer activity[J]. Opto-Electronic Advances, 2023, 6(7): 230007

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- Opto-Electronic Advances
- Vol. 6, Issue 7, 230007 (2023)

Fig. 1. (a ) Chemical structures of the template and target compounds. (b ) The normalized UV-vis absorption and PL spectra of HPJP and DHN-DJP in DCM solutions.

Fig. 2. (a ) Diagram of the ESDPT process in DHNs. (b ) Calculated relative energies (kcal/mol) on S0 and S1 of DHN-DMP in vacuum.

Fig. 3. (a , c , e ) The normalized UV‒vis absorption and PL spectra of DMN- and DHN-doped PS films. (b , d , f ) The decay plots and fitted curves of DHNs.

Fig. 4. (a ) Schematic diagram of a single DHN-doped microsphere. (b ) PL micrograph of a single DHN-doped microsphere. Inset: scanning electron microscopy image of a single DHN-doped microsphere. (c ) Partial magnifications of PL spectra of DHN-doped microspheres with different sizes. (d ) The related curve of λ2/Δλ (λ: emission wavelength; Δλ: the space between the individual resonance peaks) at 700 nm versus D (D: diameter of selected microsphere). Inset: the simulated electric energy density in the cross-section of a microsphere with dimeter D = 10 µm. Red corresponds to the highest field density and blue is the lowest field density.

Fig. 5. PL spectra of (a ) DHN-DMP-, (d ) DHN-DPP- and (g ) DHN-DJP-doped PS microspheres under different pump densities. (b) Plots of lasing intensity as a function of pump density of a (b ) DHN-DMP-, (e ) DHN-DPP- and (h ) DHN-DJP-doped PS microsphere. Insets: brightfield micrographs of the PS microspheres used in laser measurements. (c ) 2D mappings of lasing intensity versus the number of pulses of a (c) DHN-DMP-, (f ) DHN-DPP- and (i ) DHN-DJP-doped PS microsphere, pumping density: 47.8 µJ/cm2.

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