Figure 7. The schematic diagram for running space-time dual-resolved logic gate within a 1D ZnCl 2 -B metal-organic complex microrod, which is based on the simultaneous space-resolved optical waveguide and time-resolved afterglow properties.

Alternations of crystalline and amorphous states largely influence the solid‐state properties of molecular materials. In their Research Article (e202217054), Dongpeng Yan and co‐workers show that the transformation between two states of an anthracene‐based metal‐organic complex can tune the photosalient effect, mechanical luminescence, and photochromism behavior. The effect was assigned to competitive chemical routes between a photocycloaddition reaction in the crystalline state and photogenerated radicals in the amorphous state.

Photo‐controllable persistent luminescence at the single crystal level can be achieved by the integration of long‐lived room temperature phosphorescence (RTP) and photochromism within metal–organic frameworks (MOFs) for the first time. Moreover, the multiblock core–shell heterojunctions have been prepared utilizing the isostructural MOFs through an epitaxial growth process, in which the shell exhibits bright yellow afterglow emission that gradually disappears upon further irradiation, but the core does not show such property. Benefitting from combined persistent luminescence and photochromic behavior, a multiple encryption demo can be facilely designed based on the dynamic manipulating RTP via reversible photochromism. This work not only develops new types of dynamically photo‐controllable afterglow switch, but also provides a method to obtain MOFs‐based optical heterojunctions towards potential space/time‐resolved information encryption and anti‐counterfeiting applications.

White light-emitting diodes ͑LEDs͒ were fabricated by associating an InGaN-based blue LED chip with highly luminescent phosphors, Y 3 Al 5 O 12 :Ce 3+ ͑YAG:Ce͒ and CaSiAlN 3 :Eu 2+ . The thermal stability of these phosphors, depending weakly on the composition and the activator concentration, remains high over a wide range of temperatures ͑25-300°C͒. When a mixture of YAG:Ce and CaSiAlN 3 :Eu 2+ was coated on a blue LED, the resultant white LED had a high luminous efficiency of L = 68 lm/W, a high color rendering index of Ra = 93, and a color temperature of T C = 3007 K ͑at 50 mA͒. Additionally, the color coordinates, Ra and T C , of the white LED tend to remain constant against an appreciable variation in applied current.Global warming is worsening on account of the consumption of fossil fuels, which produce CO 2 gas, 1 and the fact that a large amount of energy is required for illumination, including both industrial and residential lighting. Accordingly, white light-emitting diodes ͑WLEDs͒ represent a potential next-generation illumination source, as they have very favorable properties, such as high energy efficiency, low power consumption, reliability, and environmental protection. [2][3][4][5] Phosphors are important materials in lighting and have been extensively investigated. 6 The most universal WLED employs a 450-470 nm blue-emitting chip that is coated with a yellow phosphor, Y 3 Al 5 O 12 :Ce ͑Ce-doped yttrium alumina garnet, YAG:Ce͒. The color rendering property of YAG:Ce-based WLEDs is poor owing to a red deficiency of the phosphor YAG:Ce. This problem has attracted the attention of numerous researchers, who have sought to improve the color rendering property of phosphor-converted ͑pc͒ WLEDs. Jang et al. 7 enhanced the color rendering property of the YAG:Ce phosphor by adding Pr and Tb as a coactivator, at the expense of reducing luminous efficiency by energy transfer and increasing the cost of manufacture. Wu et al. 8 reported on a blue light-emitting diode ͑LED͒ that was precoated with green/red phosphors; its luminous efficiency was low and the red-emitting phosphor reached luminescence saturation as the applied current was increased. In addition, Kimura et al. 9 also used a multicomponent oxynitride and nitride phosphors mixture, pumped with blue light to produce an extrahigh color rendering white light, producing the drawbacks of complex blending operations and a decrease in the device efficiency. Such as that of inorganic phosphors, the color rendering property of quantum-dot-assisted YAG:Ce-based WLEDs was excellent, as revealed by the work of Ziegler et al. 10 on InP/ZnS nanocrystals as converter materials.In this study, oxide-and nitride-based highly luminescent phosphors, such as yellow-emitting YAG:Ce and red-emitting CaSiAlN 3 :Eu 2+ , respectively, are adopted. A mixture of YAG:Ce and CaSiAlN 3 :Eu 2+ was excited using a blue LED, and the WLED thus comprised a high luminous efficiency, high color rendering index, and Commission International del'Eclairage ͑CIE͒ chromaticity coordinates th...

Persistent luminescence has attracted great attention due to the unique applications in molecular imaging, photodynamic therapy, and information storage, among many others. However, tuning the dynamic persistent luminescence through molecular design and materials engineering remains a challenge. In this work, the first example of excitation-dependent persistent luminescence in a reverse mode for smart optical materials through tailoring the excited-state proton transfer process of metal cytosine halide hybrids is reported. This approach enables ultralong phosphorescence and thermally activated delayed fluorescence emission colors highly tuned by modulation of excitation wavelength, time evolution, and temperature, which realize multi-mode dynamic color adjustment from green to blue or cyan to yellow-green. At the single crystal level, the 2D excitation/space/time-resolved optical waveguides with triple color conversion have been constructed on the organic-metal halide microsheets, which represent a new strategy for multi-dimensional information encryption and optical logic gate applications.