Activating room temperature phosphorescence by organic materials using synergistic effects

Abstract

We present a design principle to activate highly efficient organic room temperature phosphorescent (ORTP) of carbon dots (CDs), with layered double hydroxides (LDHs) as the host matrix, that utilizes three synergistic effects,i.e.structural confinement effect, heavy atom effect, and chemical bonding.

Visible‐Light‐Excited Ultralong‐Lifetime Room Temperature Phosphorescence Based on Nitrogen‐Doped Carbon Dots for Double Anticounterfeiting

“…The absolute fluorescence quantum yield (QY) of the CDs excited at 371 nm was about 20%, which was comparatively higher QY for CDs. The absolute phosphorescence QY of CDs is 11.5% under the excitation of 365 nm 32. Impressively, the URTP of CDs could also be activated by visible light in solid‐state.…”

Afterglow of carbon dots: mechanism, strategy and applications

“…32,43,84,88 It should be noted that, however, in order to produce room temperature afterglow from CDs, matrices have usually been utilized to immobilize the materials and thus to stabilize the produced T 1 species, so as to make radiative transitions possible from the spin-forbidden process (i.e., from T 1 to S 0 ). 31,34,35,39,43,61,62,84,86,87,[89][90][91][92][93][94][95][96][97][98][99][100][101] More interestingly, self-protective CDs (without matrix immobilization) Fig. 1 The schematic illustration of the emissive processes of fluorescence (a), phosphorescence (b), and delayed fluorescence (c).…”

“…2d), 96 Al 2 (SO 4 ) 3 , 97 KAl(SO 4 ) 2 ÁxH 2 O, 101 zeolites, 90,114 alkaline earth (Ca, Sr, and Ba) carbonate, 92 layered double hydroxides (LDHs) (Fig. 2e), 91,95,99,115 boric acid and molten salt, 34,89 were also employed to prepare CD-based RTP composites.…”

Exploiting synergy between ligand design and counterion interactions to boost room temperature phosphorescence from Cu(i) compounds

“…Namely, in instances where the impact of one strategy on its own is limited, could combining ligand modification and solid--state effects enhance photophysical properties to potentially expand the reach of these design strategies, similar to the recently reported synergistic activation of room temperature phosphorescence in organic materials. 13 Here, we report a case study using homoleptic Cu(I) complexes of bidentate P^N-coordinating ligands based on a phenanthridine unit substituted at the 4--position with a diphenylphosphine moiety:…”

“…L3 was then accessed via lithium--halogen exchange between 4--bromo--2,6--dimethylphenanthridine and sec--butyllithium, followed by quenching with Ph 2 PCl. Evidence for the assembly of the phenanthridine core could be discerned in the downfield shift of the "imine--like" C 6 resonance in the 13 Figure S1). In comparison, the equivalent halide--…”