Organic ultralong room temperature phosphorescence (OURTP) materials with photophysical properties sensitive to external stimulus are highly attractive for advanced applications.H owever,m ost OURTPm olecules are in crystal and OURTP materials with good practicability and stimulusresponsive character are hard to be achieved. Here,wereport, for the first time,the highly efficient, ultralong-lived and deepblue OURTPmaterials by simply doping boron phosphor into cyanuric acid host. Host-guest OURTP composites with abundant and tunable H-bond network are highly stable in air with ultralong lifetime of 5.08 satroom temperature.They are sensitive to water,which can strength the H-bond network to significantly enhance OURTP quantum yield from 16.1 %to 37.6 %. Anti-counterfeiting paper was easily prepared for water-jet printing;t he jet-printed high-resolution OURTP patterns can be easily erased by solvent fuming for another printing/erasing cycle with high reversibility.

Achieving single-component white organic afterglow remains ag reat challenge owingt ot he difficulties in simultaneously supporting long-lived emissions from varied excited states of am olecule for complementary afterglow.Here,a ne xtraordinary tri-mode emission from the radiative decays of singlet (S 1 ), triplet (T 1 ), and stabilized triplet (T 1 * ) excited states was proposed to affordw hite afterglowt hrough modulating the singlet-triplet splitting energy (DE ST )a nd exciton trapping depth (E TD ). Low-lying T 1 *f or yellow afterglow was constructed by H-aggregation engineering with large E TD and trace isomer doping, while high-lying T 1 and S 1 for blue afterglow with thermally activated emission feature were realized by reducing DE ST through donor-acceptor molecular design. Therefore,t he single-component white afterglow with high efficiency of 14.1 %a nd al ifetime of 0.61 sw as achieved by rationally regulating the afterglow intensity ratios of complementary emissions from S

Circularly polarized luminescence (CPL) molecules, especially those with thermally activated delayed fluorescence (TADF) properties, have attracted considerable attention due to their great potential for chiroptical organic light emitting diode (OLED) devices. Here we developed a new pair of TADF emitters with CPL based on boron complexes using chiral donor (cD) binaphthalene, acceptor (A) biphenyl boron β-diketonate, and donor (D) biphenylamine in a cD–A–D architecture. With this design, both efficient intramolecular charge transfer (ICT) and chiral ICT for high-performance CPL were established, leading to high dissymmetry factors (|g lum|) up to 2.2 × 10–3 in solution and significantly red-shifted emission around 600 nm for red TADF with a quantum yield over 15% in doped films. More impressively, with these chiral TADF emitters, solution-processed red circularly polarized OLEDs (CP-OLEDs) exhibit external quantum efficiencies (EQEs) up to 2.0% and efficient circularly polarized electroluminescence with dissymmetry factors of 2.6 × 10–3, which are among the best performances of the reported solution-processed orange-red and red TADF CP-OLEDs. These results illustrate the great success of the cD–A–D strategy in designing high-performance CPL TADF emitters with axially chiral boron complexes, providing important clues to understand efficient chiral transfer for large |g lum| values and high device performance of CP-OLEDs.

An intermolecular locking strategy was proposed to improve both the solution processibility and photoluminescence efficiency of red TADF emitters for solution-processed OLEDs with an EQE up to 8.2% and an efficiency roll-off of 9.0% at 1000 cd m−2.

We present MUSE at VLT imaging spectroscopy of rest-frame ultraviolet emission lines and ALMA observations of the [C I] 3P1−3P0 emission line, probing both the ionized and diffuse molecular medium around the radio galaxy 4C 19.71 at z ≃ 3.6. This radio galaxy has extended Lyα emission over a region ∼100 kpc in size preferentially oriented along the axis of the radio jet. Faint Lyα emission extends beyond the radio hot spots. We also find extended C IV and He II emission over a region of ∼150 kpc in size, where the most distant emission lies ∼40 kpc beyond the north radio lobe and has narrow full width half maximum (FWHM) line widths of ∼180 km s−1 and a small relative velocity offset Δv ∼ 130 km s−1 from the systemic redshift of the radio galaxy. The [C I] is detected in the same region with FWHM ∼ 100 km s−1 and Δv ∼ 5 km s−1, while [C I] is not detected in the regions south of the radio galaxy. We interpret the coincidence in the northern line emission as evidence of relatively quiescent multi-phase gas residing within the halo at a projected distance of ∼75 kpc from the host galaxy. To test this hypothesis, we performed photoionization and photo-dissociated region (PDR) modeling, using the code Cloudy, of the three emission line regions: the radio galaxy proper and the northern and southern regions. We find that the [C I]/C IVλλ1548,1551 and C IVλλ1548,1551/He II ratios of the two halo regions are consistent with a PDR or ionization front in the circumgalactic medium likely energized by photons from the active galactic nuclei. This modeling is consistent with a relatively low metallicity, 0.03 < [Z/Z⊙] < 0.1, and diffuse ionization with an ionization parameter (proportional to the ratio of the photon number density and gas density) of log U ∼ −3 for the two circumgalactic line emission regions. Using rough mass estimates for the molecular and ionized gas, we find that the former may be tracing ≈2−4 orders of magnitude more mass. As our data are limited in signal-to-noise due to the faintness of the line, deeper [C I] observations are required to trace the full extent of this important component in the circumgalactic medium.