Long-wavelength multicolor emission and high photoluminescence quantum yields (PLQYs) play a key role in carbon dot (CD)-based luminescent solar concentrators (LSCs). Herein, long-wavelength multicolor-emitting CDs with high PLQYs had been synthesized by one-step solvothermal process of phenylenediamine (PD) isomers (m-, o-, p-PDs) in the presence of lignin. Relying on the introduction of lignin, green (G), yellow (Y), and red (R) emissive CDs without excitation wavelength dependence could be achieved. The R, Y, G CDs showed clearly red shift effect in PL emission spectra, compared to the control CDs samples (Rc, Yc, Gc CDs) only based on PD isomers as precursors. The PL red shift probably resulted from the size effect of CDs. Remarkably, the R, Y, G CDs with high PLQYs (15.01, 41.52, and 7.60%) had been achieved owing to their long PL lifetimes, which is also higher than that of control Rc, Yc, Gc CDs samples (PLQYs of 12.66, 38.32, and 3.48%). Moreover, the tandem LSCs based on the R, Y, G CDs had further been demonstrated. The external optical efficiency (η opt ) and power conversion efficiency (η) of LSCs had been enhanced greatly up to 4.03 and 2.92%, respectively, compared to that of LSCs based on the control CDs LSCs (only have 3.76 and 2.66%).
Circularly polarized luminescent (CPL) materials have received a lot of interest due to their potential applications in next-generation displays. However, the development of easily accessible red circularly polarized phosphorescent emitters for practical organic light-emitting diodes fabrication remains a grand challenge. In this paper, we report a new family of CPL-active platinum complexes based on the binaphthalene chiral platform. These axially chiral platinabinaphthalenes were facile synthesized by directly incorporating platinum(II) into the π-conjugated backbone of a commercially available enantiopure binaphthalene derivate. These complexes exhibit aggregation-induced circularly polarized phosphorescence enhancement with high quantum yields of up to 66% and luminescence dissymmetry factors of around 2.6 × 10 −3 . Moreover, solution-processable circularly polarized organic light-emitting diodes (CPOLEDs) using these complexes as emitters show good performance with the maximum luminance of up to 3500 cd m −2 and dissymmetry factor values of around 1.0 × 10 −3 . These findings by the rational design of axially chiral platinabinaphthalenes are important for the development of highperformance CPL complexes for CPOLEDs.
Organic-inorganic halide perovskite semiconductors are ideal gain media for fabricating laser and photonic devices due to high absorption, photoluminescence (PL) efficiency and low nonradiative recombination losses. Herein, organic-inorganic halide perovskite CH3NH3PbI3 is embedded in the Fabry-Perot (FP) microcavity, and a wavelength-tunable excitonic lasing with a threshold of 12.9 μJ cm-2 and the spectral coherence of 0.76 nm are realized. The lasing threshold decreases and the spectral coherence enhances as the temperature decreases; these results are ascribed to the suppression of exciton irradiative recombination caused by thermal fluctuation. Moreover, both lasing and light emission below threshold from the perovskite microcavity (PM) system demonstrate a redshift with the decreasing temperature. These results provide a feasible platform based on the PM system for the study of light-matter interaction for quantum optics and the development of optoelectronic devices such as polariton lasers.
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