A simple and effective strategy on producing solution-processable materials with highly efficient and persistent room-temperature-phosphorescence (RTP) is presented here.

Herein, new types of zero‐dimensional (0D) perovskites (PA6InCl9 and PA4InCl7) with blue room‐temperature phosphorescence (RTP) were obtained from InCl3 and aniline hydrochloride. These are highly sensitive to external light and force stimuli. The RTP quantum yield of PA6InCl9 can be enhanced from 25.2 % to 42.8 % upon illumination. Under mechanical force, PA4InCl7 exhibits a phase transform to PA6InCl9, thus boosting ultralong RTP with a lifetime up to 1.2 s. Furthermore, white and orange pure RTP with a quantum yield close to 100 % can be realized when Sb3+ was introduced into PA6InCl9. The white pure phosphorescence with a color‐rendering index (CRI) close to 90 consists of blue RTP of PA6InCl9 and orange RTP of Sb3+. Thus, this work not only overcomes long‐standing problems of low quantum yield and short lifetime of blue RTP, but also obtains high‐efficiency white RTP. It provides a feasible method to realize near‐unity quantum efficiency and has great application potential in the fields of optical devices and smart materials.

Herein, an organic fluorophore termed NLAC is introduced into 2D hybrid perovskites with wide band gap (>3.54 eV) to give a green emission with quantum yield up to 81%. The highly efficient luminescence is ascribed to avoiding the aggregation of NLAC and formation of an inorganic free exciton which is easy to thermally quench. On this basis, a new strategy to generate efficient white emission with afterglow has been proposed by codoping a short-wavelength fluorophore and long-wavelength phosphor into 2D organic− inorganic hybrid perovskites (OIHPs). As a result, a single-component white-light-emitting material PEPC-3N based on NLAC with CIE of (0.33, 0.36) and quantum yield up to 43% can be obtained. Interestingly, PEPC-3N shows a dual-color organic afterglow and excitation-wavelength-dependent emission, consequently forming a switch between green fluorescence and yellow afterglow. This unique performance indicates PEPC-3N has huge potential in afterglow WLEDs and information storage.

Organic afterglow materials (OAMs) with a lifetime longer than 0.1 s have recently received much attention for their fascinating properties meeting the critical requirements of applications in newly emerged technologies. However, the development of OAMs lags behind for their low luminescence efficiency. Usually, enhancing the phosphorescence efficiency of organic materials causes a short lifetime. Here, we report two kinds of OAMs, two-dimensional (2D) layered organic–inorganic hybrid zinc bromides (PEZB-NTA and PEZB-BPA), obtained in an environmentally friendly ethanol solvent by a low-temperature solution method. They display highly efficient and persistent luminescence in air in both crystals and thin films with phosphorescence quantum yields up to 42% in crystals and 27% in films. For OAMs, the two quantum yields are the highest values ever reported for crystals and films. Due to the excellent crystalline and film-forming ability, PEZB-NTA and PEZB-BPA in ethanol can be used as inks to construct patterns on various rigid and flexible substrates, including paper, iron, plastic, marble, tin foil, and cloth. Consequently, the novel OAMs show great application prospects in the fields of anti-counterfeiting and information storage because of their economic synthesis, solution processing, and easy operation.

Organic room‐temperature phosphorescence (RTP), especially ultralong organic RTP (UOP), has great application potential in emerging fields, such as flexible intelligent information encryption, optical anticounterfeiting, and biological imaging. Therefore, the studies on organic RTP and UOP have attracted extensive attention in recent years. Various strategies, such as crystallization, host–guest interactions, spatial confinement, and introducing weak forces of heteroatoms, have been used to improve phosphorescence quantum yield and lifetime. Among them, the confinement effect of inorganic micro/nanostructures can effectively promote highly stable and tunable organic RTP and UOP. Both the efficiency and lifetime of RTP for organic phosphors within inorganic micro/nanostructures can be improved by the confinement of inorganic frameworks, together with interactions between organic and inorganic components. Herein, the recent progress in the RTP and UOP of organic molecules assembled in micro/nanostructures of organic/inorganic hybrid materials is summarized, including low‐dimensional metal halides, metal−organic frameworks with ordered nanochannels, silica nanocomposites with micro/nanopores, and layered nanoclays. In particular, the characteristics of each hybrid structure which are beneficial for RTP are highlighted. Finally, future directions of each hybrid material are suggested to continue to expand this area of research.

A simple organic molecule displays both mechanoluminescence and room-temperature phosphorescence switching. A D–A type dimer is found to be responsible for the switching.

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Organic-inorganic hybrid metal halides have attracted intensive attention because of their unique electronic structure and solution processability. They have rigid micro/nano structure and heavy atom effect, which has obvious advantages...