Despite the success of thermally activated delayed fluorescence (TADF) emitters in monochromatic organic light‐emitting diodes (OLED), only few efficient full‐TADF white OLEDs (WOLED) are reported because of the challenge in rational exciton allocation between blue and other color emitters. Herein, it is demonstrated that the appropriate exciton delocalization in blue TADF matrixes can simultaneously support the sufficient blue emission and the energy loss–free charge and exciton transfer to yellow TADF emitters. Through introducing steric hindrance–modulated intermolecular hydrogen bond networks, a fluorinated carbazole‐phosphine oxide hybrid realizes the balance of exciton localization and delocalization, giving rise to state‐of‐the‐art external quantum efficiency beyond 20% from its simple trilayer full‐TADF WOLEDs, accompanied by excellent spectral stability. The correlation between the efficiencies of the blue TADF matrixes and their intermolecular interactions reveals that the exciton delocalization is crucial for the exciton allocation optimization in multicomponent emission systems.

The optoelectronic applications of clusters emerged rapidly. Cluster light‐emitting diodes (CLED) as representative hold promise as a new generation of displays and lightings. However, as one of the main challenges in electroluminescence (EL) field, until present, no deep‐blue CLEDs were reported, due to the strict requirements on excited‐state characteristics of clusters. Herein, two phosphine‐stabilized Au3 triangle and Au3Ag pyramid named [O(Audppy)3]BF4 and [O(Audppy)3Ag](BF4)2 were chosen to demonstrate efficient deep‐blue CLEDs. The ligand‐incorporated charge transfer transitions of the clusters contribute to both singlet and triplet excited states of the clusters, giving rise to phosphorescence at 460 nm and EL emissions at 436 nm. Based on device engineering, the maximum luminescence beyond 8000 nits and the chromatic coordinates with y <0.1 in deep‐blue region verify the competence of CLEDs for high‐resolution displays.

Thermally activated delayed fluorescence (TADF) white organic light-emitting diodes (WOLED) hold great potential for daily lightings, but should overcome the current limitation in power conservation. Despite amount of efforts on developing efficient TADF emitters, it is demonstrated here that the host matrix actually controls exciton formation and allocation, therefore strongly determines power efficiency. Through multiplying P≐O orientations, 248DBTTPO matrix establishes "diffusion predominance" mode to support multidirectional carrier/exciton migration, which combines the advantages of "recombination predominance" and "transport predominance" modes in alleviating dopant-dopant interactions and rationalizing carrier and energy transfer. 248DBTTPO matrix effectively balances carrier flux, singlet radiation, and triplet quenching suppression of TADF emitters, and exciton allocation in its complementary white TADF systems. As consequence, 248DBTTPO endows its trilayer single-emissive-layer WOLEDs with the state-of-theart external quantum efficiency up to 27%, ultralow driving voltages, and consequently the record-high power efficiency of 108.6 lm W −1 , which breaks through key bottleneck of TADF lighting.

The optoelectronic applications of clusters emerged rapidly. Cluster light-emitting diodes (CLED) as representative hold promise as a new generation of displays and lightings. However, as one of the main challenges in electroluminescence (EL) field, until present, no deep-blue CLEDs were reported, due to the strict requirements on excited-state characteristics of clusters. Herein, two phosphine-stabilized Au 3 triangle and Au 3 Ag pyramid named [O(Audppy) 3 ]BF 4 and [O-(Audppy) 3 Ag](BF 4 ) 2 were chosen to demonstrate efficient deep-blue CLEDs. The ligand-incorporated charge transfer transitions of the clusters contribute to both singlet and triplet excited states of the clusters, giving rise to phosphorescence at 460 nm and EL emissions at 436 nm. Based on device engineering, the maximum luminescence beyond 8000 nits and the chromatic coordinates with y < 0.1 in deep-blue region verify the competence of CLEDs for high-resolution displays.

By changing the Rabi frequency of the photoassociation laser and the atom-polymer coupling strength, we investigate the effect of external field shape on atom-polymer conversion efficiency. First, by defining time-index, the external filed shape given in literature is improved. We discuss the influence of time-index on conversion efficiency, and then choose a more optimized external filed shape, it has good parameter robustness. Under the action of the external field, the adiabatic process has almost no oscillation, the adiabatic fidelity is close to 1, and the error of the system is less. The ultracold atom-polymer molecules conversion can be realized stably and efficiently.