Abstract Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting halides remains a challenge. Here, an enlightening prototype is proposed to explore high‐efficiency broadband NIR systems by incorporating Sb 3+ into Cs 2 ZnCl 4 matrix. Combined experimental analysis density functional theory calculations reveal...

Following pioneering work, solution-processable Mn4+-activated fluoride pigments, such as A2BF6 (A = Na, K, Rb, Cs; A2 Ba, Zn; B Si, Ge, Ti, Zr, Sn), have attracted considerable attention highly promising red phosphors for warm white light-emitting diodes (W-LEDs). To date, these pigments been synthesized via traditional chemical routes with HF solution. However, in addition to the possible dangers of hypertoxic HF, uncontrolled precipitation fluorides and extensive processing steps produce...

Abstract Doping impurity ions into semiconductor luminescent materials offers a unique pathway for inducing new emission centers and enabling photoluminescence (PL) tuning. Among various luminescence materials, doping Mn 2+ metal halide perovskites becomes hot topic since demonstrate an energy transfer route from host to dopants, resulting in interesting photophysical properties. This review aims discuss the PL properties of nanocrystals or bulk crystals with different structural dimensions...

Abstract Photoluminescence originated from doped activators in the solid state materials usually faces challenge of concentration quenching, restricting further increase photoluminescence intensity. Herein, a new strategy is demonstrated by heavy doping Mn 2+ into MgAl 2 O 4 , leading to broad‐band near‐infrared (NIR) emission peaking at ≈825 nm with full width half maximum ≈125 nm, as well high internal quantum efficiency ≈53% upon 450 laser excitation. Density functional theory calculation...

Abstract The development of highly efficient and thermally stable broadband near‐infrared (NIR) luminescence materials is a great challenge to advance the next‐generation smart NIR light source. Benefitting from low phonon energy relatively weak electron coupling effect fluoride, K 2 NaScF 6 :Cr 3+ phosphor designed obtained, which demonstrates full width at half maximum 100 nm peaking ≈765 nm. Upon blue excitation, exhibits high quantum efficiency 74% its emission intensity 150 °C can keep...

Due to the unique narrow-band red emission and broadband blue light excitation, as well milder synthesis conditions, Mn4+ ion activated fluoride phosphors show great promise for white emitting diode (W-LED) applications. However, belongs a spin-forbidden transition (2Eg → 4A2), it is fundamental challenge synthesize these with high external quantum efficiency (EQE) above 60%. Herein, highly efficient thermally stable phosphor, Cs2SiF6:Mn4+, internal (IQE) of 89% ultrahigh EQE 71%...

With unique and efficient narrow-band red emission broadband blue light absorption characteristics, Mn4+-activated fluoride phosphors have gained increasing attention in warm white LEDs (WLEDs) liquid crystal display (LCD) backlighting applications, whereas the intrinsic hygroscopic nature of these inevitably limited their practical applications. Herein, a waterproof phosphor K2TiF6:Mn4+ (KTF) has been demonstrated via facile superhydrophobic surface-modification strategy. use surface...

Abstract Rapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence, especially relies on blue light pumped red phosphors for improved quality. Herein, we discovered an unprecedented red-emitting Mg 2 Al 4 Si 5 O 18 :Eu 2+ composite phosphor ( λ ex = 450 nm, em 620 nm) via the crystallization MgO–Al 3 –SiO aluminosilicate glass. Combined experimental measurement first-principles calculations verify that Eu dopants insert at...

Abstract The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources emerging applications. Herein, a series hexafluorides A 2 BMF 6 :Cr 3+ (A = Na, K, Rb, Cs; B Li, M Al, Ga, Sc, In) peaking at ≈733–801 nm with full width half maximum (FWHM) ≈98–115 are synthesized by general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation trivalent metal sources, Cr can be more efficiently doped...

Photothermal sensing is crucial for the creation of smart wearable devices. However, discovery luminescent materials with suitable dual-wavelength emissions a great challenge construction stable optical fibre temperature sensors. Benefiting from Mn2+-Mn2+ superexchange interactions, (530/650 nm)-emitting material Li2ZnSiO4:Mn2+ presented via simple increasing Mn2+ concentration, wherein two emission bands have different temperature-dependent behaviours, but exhibit quite similar excitation...

Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most can only be excited by ultraviolet radiation, the discovery high-efficient emitters with excitation characteristics, especially upon efficient blue light irradiation, is challenge. Herein, zero-dimensional (0D) Cu(I)-based organometallic halide...

Abstract Broadband near‐infrared (NIR) phosphors have recently received considerable attention in spectroscopy technology fields, but designing inexpensive, emission peaks centered above 800 nm, and multimodal broadband NIR luminescence material still remains a great challenge. Here, by selecting stannate compound Mg 2 SnO 4 (MSO) as the host, kind of phosphor MSO:Cr 3+ with multimode properties is reported. The designed exhibits an peaking at nm full‐width half maximum 180 (≈2730 cm −1 )....

Herein, a new red phosphor Na₃GaF₆:Mn⁴⁺ has been designed and synthesized by facile two-step co-precipitation method at room temperature.

An intense red fluoroaluminate phosphor, cryolite Na₃AlF₆:Mn⁴⁺, with high color purity and good thermal stability has been designed synthesized <italic>via</italic> a facile two-step method at room temperature.

A stable narrow-band green phosphor MgAl₂O₄:Mn²⁺peaking at 525 nm with a full-width half-maximum of 35 and quantum efficiency 45% upon 450 blue-light excitation is demonstrated, which has good promising for wide color gamut backlight display.

Biomedical imaging and labeling through luminescence microscopy requires materials that are active in the near‐infrared spectral range, i.e., within transparency window of biological tissue. For this purpose, tailoring Mn 2+ –Mn activator aggregation is demonstrated ABF 3 fluoride perovskites. Such promotes distinct photoluminescence antiferromagnetic super‐exchange across effective dimers. The crossover dopant concentrations for occurrence interaction first second coordination shells comply...

Abstract Narrow‐band red‐emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is major challenge. Here, highly stable K 2 SiF 6 :Mn 4+ (KSFM) single crystal with tunable sizes (20–1000 µ m) are grown by facile saturated crystallization method. The small specific surface area together unique Mn ‐rare interface layer KSFM crystals enables simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal...

Abstract Mn 4+ ‐activated red‐emitting fluoride phosphors are indispensable candidates for white light emitting diodes (WLEDs) with enhanced color rendition, however, their intrinsic hydrolysis characteristics seriously restricted the durability applications. Here, a facile and general postsynthetic hydrogen peroxide (H 2 O ) surface passivation strategy is proposed to treat K XF 6 :Mn (KXF, X = Ti, Si, Ge) phosphors, in which ‐rare protective layer appears further covers corresponding...

Highly efficient and stable broadband near-infrared (NIR) emission phosphors are crucial for the construction of next-generation smart lighting sources; however, discovery target remains a great challenge. Benefiting from interstitial Li+ occupancy-induced relatively large distorted octahedral environment Cr3+ suppressed nonradiative relaxation centers, an NIR fluoride phosphor Na3GaF6:Cr3+,Li+ peaking at 758 nm with high internal quantum efficiency 95.8% external 38.3% is demonstrated....

Transition metal Mn2+ ion activated luminescent materials with tunable visible emission and high color purity features are crucial for mondern lighting displays so forth. Herein, in contrast to the conventional of Mn2+, an olivine phosphor, Mg2GeO4:Mn2+, adjustable red (centered at ∼ 650 nm)/NIR at∼ 735 nm) emissions is demonstrated by doping ions into two different distorted octahedral MgO6 sites guided theory simulation. By varying content ions, red/NIR dual-wavelength a pure-NIR can be...

The discovery of high-efficiency Mn4+-activated fluoride red phosphors with short excited-state lifetimes (ESLs) is urgent and crucial for high-quality, wide-color-gamut display applications. However, it still a great challenge to design target both ESL high luminescence efficiency. Herein, we propose an efficient machine learning approach based on small dataset establish the prediction model, thereby facilitating new fluorides ESLs. Such model can not only accurately predict ESLs Mn4+ in...

The development of highly efficient near infrared (NIR) luminescence materials is crucial for advancing the next generation compact light sources. However, realization target material with emission in NIR-II spectral region (1000–1700 nm) remains a major challenge. Herein, phosphor Ba3BPO7:Mn5+ peaking at 1176 nm full width half maximum 22 demonstrated via selective site occupancy engineering strategy. Upon 660 red-light excitation, high internal quantum efficiency 50.6% and external 30.5%...

An anomalous near‐infrared (NIR) upconversion (UC) emission band at approximately 770 nm is demonstrated in KZnF 3 :Yb 3+ ,Mn 2+ nanocrystals with heavy Mn doping. This would enable advanced biological imaging improved resolution and enhanced penetration depth. Careful studies based on structure analysis, excitation spectra, luminescence decay curves indicate that this unusual NIR (770 nm) originates from the 6 A 1g (S) 4 T (G)→ transitions of –Mn dimers. The influence concentration...

A novel high efficiency red emitting Sr2MgAl22O36:Mn4+ phosphor is synthesized by solid-state reaction method. The optimized exhibits quantum (QE) of ∼80%, fluorescence lifetime ∼1.25 ms and the Commission International de I'Eclairage (CIE) chromaticity coordinates (0.72, 0.27). shows excitation bands at ∼400 470 nm which matches well with working wavelength existed LED chips can be used as source to generate white emission. White was fabricated using mixed phosphors (Sr, Ba)2SiO4:Eu2+...