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Zero‐dimensional (0D) hybrid metal halides have been emerged as room‐temperature phosphorescence (RTP) materials, but synchronous optimization of multiple phosphorescence performance in one structural platform remains less resolved, and stable RTP activity in aqueous medium is also unrealized due to serious instability toward water and oxygen. Herein, we demonstrated a photophysical tuning strategy in a new 0D hybrid zinc halide family of (BTPP)2ZnX4 (BTPP=benzyltriphenylphosphonium, X=Cl and Br). Infrequently, the delicate combination of organic and inorganic species enables this family to display multiple ultralong green afterglow and efficient self‐trapped exciton (STE) associated cyan phosphorescence. Compared with inert luminescence of [BTPP]+ cation, incorporation of anionic [ZnX4]2− effectively enhance the spin‐orbit coupling effect, which significantly boosts the photoluminescence quantum yield (PLQY) up to 30.66 % and 54.62 % for afterglow and phosphorescence, respectively. Synchronously, the corresponding luminescence lifetime extend to 143.94 ms and 0.308 μs surpassing the indiscernible phosphorescence of [BTPP]X salt. More importantly, this halide family presents robust RTP emission with nearly unattenuated PLQY in water and harsh condition (acid and basic aqueous solution) over half a year. The highly efficient integrated afterglow and STE phosphorescence as well as ultrahigh aqueous state RTP realize multiple anti‐counterfeiting applications in wide chemical environments. [ABSTRACT FROM AUTHOR]

Lead halide perovskites have multiple optoelectronic functions because of their intriguing photophysical properties. Unfortunately, their extensive application prospects are limited by their high toxicity and instability. For these reasons, it is significant to assemble novel lead-free halides with high-performance luminescence properties. Environment-friendly In3+-based halides are gaining increasing interest because of their high stabilities and photoluminescence quantum yields (PLQYs). In this research work, we synthesized a zero-dimensional (0D) hybrid indium chloride single crystal of [1-Me-Pipz]2[InCl6]Cl·H2O (1-Me-Pipz = protonated 1-methylpiperazine) that demonstrated strong self-trapped exciton (STE)-associated broadband yellow light emission with a sufficient PLQY of 51.58%. Moreover, [1-Me-Pipz]2[InCl6]Cl·H2O exhibits extremely excellent structural and spectral stability in a variety of harsh environments. Importantly, the outstanding optoelectronic characteristics allow indium perovskite to be used for the successful fabrication of white light-emitting diodes (WLEDs) with a high color rendering index of 86.4. This work enriches the literature on indium halide perovskites and provides a novel viewpoint for the possible applications of 0D In3+ perovskite-based luminescent materials. [ABSTRACT FROM AUTHOR]

Low-dimensional organic–inorganic hybrid lead halide perovskites have attracted much interest in solid-state lighting and displays, but the toxicity and instability of lead halide are obstacles to their industrial applications, which must be overcome. As an alternative, Cu(I)-based hybrid metal halides have emerged as a new type of luminescent material owing to their diversified structure, adjustable luminescence, low toxicity and low cost. Herein, we report three one-dimensional (1D) hybrid Cu(I)-based halides with the general formula ACu2Br4 (A = [(Me)4-Pipz]2+ and [BuDA]2+ and [TMEDA]2+). These 1D hybrid Cu(I) halides display stable broadband blue emission with maximum emission peaks in the range of 445–474 nm and the highest photoluminescence quantum yield of 37.8%. Furthermore, in-depth experimental and theoretical investigations revealed that the broadband blue emissions originate from the radiative recombination of self-trapped excitons. Most importantly, there is no structural degradation and attenuation of emission intensity even after continuously soaking these halides in water for at least two months, demonstrating their ultra-high anti-water stability. Hirshfeld surface analysis shows that a large number of weak hydrogen bonds can protect the inorganic skeleton from degradation due to water. This work provides a new strategy for the design of water-stable Cu(I)-based halides with efficient blue emission and wide potential applications in humid environments. [ABSTRACT FROM AUTHOR]

Zero‐dimensional (0D) hybrid manganese halides have gained wide attention for the various crystal structures, excellent optical performance and scintillation properties compared with 3D lead halide perovskite nanocrystals. In this work, a new family of 0D hybrid manganese halides of A2MnBr4 (A = BzTPP, Br‐BzTPP, and F‐BzTPP) based on discrete [MnBr4]2− tetrahedral units is reported as highly efficient lead‐free scintillators. Excited by UV or blue light, these hybrids emit bright green light originating from the d–d transition of Mn2+ with near‐unity PLQY (99.5%). Significantly, high PLQY and low self‐absorption render extraordinary radioluminescence properties with the highest light yield of 80,100 photons MeV−1, which reached the climax of present hybrid manganese halides and surpassed most commercial scintillators. The radioluminescence intensity features a linear response to X‐ray doses with a detection limit of 30 nGyair s−1, far lower than the requirement of medical diagnostic (5.5 µGyair s−1). X‐ray imaging demonstrates ultrahigh spatial resolution of 14.06 lp mm−1 and short afterglow of 0.3 ms showcasing promising application prospects in radiography. Overall, we demonstrated new hybrid manganese halides as promising scintillators for advanced applications in X‐ray imaging with multiple superiorities of nontoxicity, facile‐assembly process, high irradiation light yield, excellent resolution, and stability. [ABSTRACT FROM AUTHOR]

A new one-dimensional hybrid [APCHA]Cu2I4 was designed and applied as an X-ray scintillator. It exhibits broad-band green emission with a high PLQY of 74.80% and excellent stability. It demonstrates radioluminescence property with a light yield of 28 336 photons MeV−1, detection limit of 41 nGyair s−1, and high spatial limit of 13.95 lp mm−1 in X-ray imaging. [ABSTRACT FROM AUTHOR]

Despite the ultra‐high photoluminescence quantum yield (PLQY) of 0D hybrid manganese halides as state‐of‐the‐art luminescent materials, intrinsic water stability remains an unsurpassable barrier due to the serious hygroscopicity of the hydrogen‐bonding structure. Herein, a synthetic strategy that realizes adjustable emission color and high water resistance in a 0D hybrid manganese chloride family based on the same cation of [H2TMDAP]2+ (TMDAP = N,N,N′,N′‐tetramethyl‐1,3‐diaminopropane) is reported. Specifically, direct solution or solid‐state reaction of precursor materials generates [H2TMDAP]3[MnCl4]2[Mn2Cl6], while additional Zn2+‐doping as a structural directing agent results in [H2TMDAP]Mn0.63Zn0.37Cl4. Functionally, the [Mn/ZnCl4]2− tetrahedron based [H2TMDAP]Mn0.63Zn0.37Cl4 displays green light emission at 521 nm with a PLQY of 63.9%. [H2TMDAP]3[MnCl4]2[Mn2Cl6] is composed of a [MnCl6]4− octahedron based [Mn2Cl6]2− chain and a discrete [MnCl4]2− tetrahedron, but it only exhibits single red emission at 628 nm with a PLQY of 48.1%. Compared with water‐instable [H2TMDAP]Mn0.63Zn0.37Cl4, [H2TMDAP]3[MnCl4]2[Mn2Cl6] represents extraordinary chemical stability in humid air and water over 1 month, manifested by an unchanged structural lattice and sufficient emission intensity. Significantly, the ultra‐high water proof performance of [H2TMDAP]3[MnCl4]2[Mn2Cl6] is nearly unmatchable among all previously reported manganese halides as far as is known. The combined merits of tunable emission wavelength, high PLQY, and stability highlight the potential applications of title materials in solid‐state lighting and display diodes. [ABSTRACT FROM AUTHOR]

Despite the extraordinary X‐ray scintillation performance of three‐dimensional (3D) lead perovskite nanocrystals (PNCs), the serious biotoxicity of Pb2+ and luminescent instability in water remain insurmountable obstacles for their applications in medical imaging. To address these drawbacks, herein, the study demonstrates one new lead‐free zero‐dimensional (0D) hybrid cuprous halide of single‐crystalline [BzTPP]2Cu2I4 (BzTPP = Benzyltriphenylphosphonium) as a satisfactory X‐ray scintillator. [BzTPP]2Cu2I4 displays broadband yellowish‐green light emission with a high photoluminescent quantum yield (PLQY) of 44.2% and large Stokes shift of 167 nm upon UV light excitation. High PLQY and negligible self‐absorption enable [BzTPP]2Cu2I4 to display impressive scintillation performance excited by X‐ray with a light yield of 27 706 photons MeV‐1 and low detection limit of 0.352 µGy s−1, surpassing typical 3D PNCs. More importantly, [BzTPP]2Cu2I4 represents extraordinary structural and luminescent stability in water for at least one month. The excellent and stable radioluminescence performance as well as solution growth method ensure a [BzTPP]2Cu2I4‐based screen for fine‐resolution X‐ray imaging with potential in radiography and inspection. This work highlights the multiple merits of low‐toxicity and cost, high light yield, and long‐term water‐stability of 0D hybrid cuprous halides as highly desirable X‐ray scintillators. [ABSTRACT FROM AUTHOR]

In the relentless pursuit of developing high-performance, stable and environmentally friendly materials for X-ray detection, we present a new class of Bi-based hybrid organic–inorganic perovskites. An X-ray detector based on a new zero-dimensional (0D) triiodide-induced lead-free hybrid perovskite, (DPA)2BiI9 (DPA = C5H16N22+), has been developed demonstrating outstanding detection performance, including high X-ray sensitivity (20 570 μC Gyair−1 cm−2), low detectable dose rate (0.98 nGyair s−1), fast response time (154/162 ns) and excellent long-term stability. [ABSTRACT FROM AUTHOR]