A series of nano/micro-sized metal-organic frameworks with tunable photoluminescence properties

Present studies on metal-organic frameworks (MOF) mainly focus on macro-scaled single crystals. However, the realization of MOF nanocrystals via a bottom-up one-step method still remains a significant challenge. Here, hierarchically assembled nanostructures of lanthanide-based MOFs with 1D and 3D morphologies have been successfully fabricated via a simple and rapid solution phase method at room temperature. Upon UV excitation, these nanomaterials exhibit highly efficient tunable luminescence properties, which come from the Eu3+ or Tb3+ ions. Moreover, white-light emission can be achieved by co-activating the organic ligand, Eu3+ and Tb3+ ions in the nano-MOFs. This journal i

The role of monocytes in thrombotic diseases: a review

Cardiovascular and cerebrovascular diseases are the number one killer threatening people's life and health, among which cardiovascular thrombotic events are the most common. As the cause of particularly serious cardiovascular events, thrombosis can trigger fatal crises such as acute coronary syndrome (myocardial infarction and unstable angina), cerebral infarction and so on. Circulating monocytes are an important part of innate immunity. Their main physiological functions are phagocytosis, removal of injured and senescent cells and their debris, and development into macrophages and dendritic cells. At the same time, they also participate in the pathophysiological processes of pro-coagulation and anticoagulation. According to recent studies, monocytes have been found to play a significant role in thrombosis and thrombotic diseases of the immune system. In this manuscript, we review the relationship between monocyte subsets and cardiovascular thrombotic events and analyze the role of monocytes in arterial thrombosis and their involvement in intravenous thrombolysis. Finally, we summarize the mechanism and therapeutic regimen of monocyte and thrombosis in hypertension, antiphospholipid syndrome, atherosclerosis, rheumatic heart disease, lower extremity deep venous thrombosis, and diabetic nephropathy

This journal is c the Owner Societies

samples, the resonance-type energy transfer is determined to be due to the dipole-dipole interaction mechanism and the critical distance is obtained through the spectral overlap approach and concentration quenching method

Luminescence properties and energy transfer of novel Bi3+ and Mn2+-co-activated Y3Ga5O12 single-component white light-emitting phosphor

A series of novel Y3Ga5O12:Bi3+,Mn2+ phosphors with controllable luminescence have been synthesized and their photoluminescence characteristics have been studied in detail with the purpose of developing a single-component white light-emitting phosphor suitable for pc-WLEDs. The Bi3+ singly-doped phosphor shows an intense blue–green emission, while the Mn2+-doped phosphor presents a narrow red emission with a FWHM of 59 nm, which is comparable to the previously reported nitride red phosphor Ca[LiAl3N4]:Eu2+. When Bi3+ and Mn2+ were co-doped into the Y3Ga5O12 matrix, effective energy transfer from the Bi3+ to Mn2+ ions was observed. Subsequently, a single-component warm white light-emitting phosphor was obtained by adjusting the doping ratio of Bi3+ and Mn2+ and by utilizing the energy transfer from the Bi3+ to Mn2+ ions. Moreover, the thermal quenching properties show that the prepared Y3Ga5O12:Bi3+,Mn2+ samples possess good thermal stability of luminescence. Finally, a WLED device with a high Ra of 90, a low CCT of 3908 K, and a CIE color coordinate of (0.3503, 0.3158) has been fabricated using the synthesized phosphor. The results indicate that Y3Ga5O12:Bi3+,Mn2+ phosphors are potential candidates as single-component white light emission phosphors applied in WLEDs. Moreover, this strategy is also conducive for the design of novel white light emission phosphors for pc-WLED

Realizing broadband spectral conversion in novel Ce3+,Cr3+,Ln3+ (Ln = Yb, Nd, Er) tridoped near-infrared phosphors via multiple energy transfers

The solar spectral converters mainly involve the energy transfer between two codoped ions. Here, we report a series of Ce3+, Cr3+, Ln3+ (Ln = Yb, Nd, Er) tridoped Gd3Sc2Ga3O12 (GSGO) phosphors with improved absorption and increasing near infrared (NIR) emission. We observed the multiple energy transfer behaviors of Cr3+→Ln3+, Ce3+→Ln3+, Ce3+→Cr3+, and Ce3+→Cr3+→Ln3+ in GSGO matrix. When Ce3+ is introduced into the GSGO:Cr3+,Ln3+ phosphors, the energy transfer of Ce3+→Cr3+→Ln3+ has been realized by utilizing the energy transfer bridge of the Cr3+ ion. Consequently, GSGO:Ce3+,Cr3+,Ln3+ can absorb almost all ultraviolet and visible (UV–Vis) light and produce strong NIR light thanks to the synergistic effect of Ce3+→Cr3+→Ln3+, improving the photovoltaic conversion efficiency of c-Si solar cells. Our results show that the prepared GSGO:Ce3+,Cr3+,Ln3+ have the potential application in the solar spectral material for c-Si solar cells. Meanwhile, the strategy of multiple energy transfers gives a new way to design the spectral conversion materials with wider absorption for c-Si solar cells

Site Occupation and Luminescence of Novel Orange-Red Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) Phosphors

Novel orange-red-emitting phosphors Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) with sufficient red light component were developed, and their lattice occupancy and luminescent properties of different color centers have been studied. In Ca3M2Ge3O12:Mn, the abnormal self-reduction of Mn4+ to Mn2+ occurs. The doped manganese ion (using MnO2 as Mn source) occupies dodecahedron Ca2+ site forming Mn2+(I) color center with orange emission, while it occupies octahedral Al3+/Ga3+ site forming Mn2+(II) and Mn4+ color centers with red and deep red light emission. The thermal quenching properties show that Ca3M2Ge3O12:Mn (M = Al, Ga) samples have low thermal quenching, and the thermal quenching of Mn2+(I) is lower than that of Mn2+(II) due to existence of more defects nearby the Mn2+(II) providing additional nonradiative recombination decay path. Ca3Al2Ge3O12:Mn has a lower thermal quenching than Ca3Ga2Ge3O12:Mn because the former possesses higher rigidity. The obtained results reveal that Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) has potential practical value in WLEDs. Moreover, the luminescence of Mn2+ and Mn4+ ions in a matrix provides a new strategy for designing and synthesizing new luminescent materials

Morphology controllable and highly luminescent monoclinic LaPO₄:Eu³⁺ microspheres

A facile, but effective, two-step method was developed to prepare monoclinic LaPO₄:Eu³⁺ microspheres composed of microprisms with a controllable morphology. XRD and SEM studies revealed a spherical morphology and crystalline structure for the resulting material. It was also found that LaPO₄:Eu³⁺ microspheres prepared at 800 °C showed a higher luminescent intensity than primary hexagonal LaPO₄:Eu³⁺ microprisms. Furthermore, the luminescent performance of LaPO₄:Eu³⁺ microspheres was demonstrated to reach the standards of the LaPO₄:Eu³⁺ bulk material under the same conditions. These results suggest possibilities for the use of as-synthesized monoclinic LaPO₄:Eu³⁺ microspheres as alternatives to replace intrinsically uneven bulk materials for many application areas, including light display systems and optoelectronic devices.6 page(s

Enhancing Luminescence and Controlling the Mn Valence State of Gd3Ga5–x–δAlx–y+δO12:yMn Phosphors by the Design of the Garnet Structure

Gd3Ga5–x–δAlx–y+δO12:yMn solid solutions with improving luminescence properties were prepared via cation substitution and a controllable Mn valence state. The abnormal autoreduction from Mn4+ to Mn2+ ions was observed during the formation of Gd3Ga5–x–δAlx–y+δO12:yMn. The doped manganese ions occupy octahedral Ga3+(1) and Al3+(1) sites to form the Mn2+ luminescent center with red emission at 630 nm and Mn4+ luminescent centers with deep red light emission at 698 nm, respectively, matching well with the red light absorption of phytochrome (PR) and the far-red light absorption of phytochrome (PFR). With the design of the concentration of Al3+ and doped manganese ions, the photoluminescence (PL) of Mn4+/Mn2+ (corresponding to PFR/PR) can be tuned, which is very useful for controlling the plant growth. Moreover, the PL intensity of Gd3Ga5–x–δAlx–y+δO12:yMn can be increased by 6.8 times by substituting Al3+ for Ga3+. The thermal stability is also enhanced significantly. Finally, a series of warm white-light-emitting diodes (WLEDs) with good performance were fabricated using the as-prepared Gd3Ga5–x–δAlx–0.012+δO12:0.012Mn phosphor. The results show that the designed Gd3Ga5–x–δAlx–y+δO12:yMn phosphors have potential practical values in plant-growth light-emitting diodes (LEDs) and high-performance WLEDs. Moreover, our strategy not only provides a unique inspiration for tuning the valence states of Mn but also designs new advanced luminescent materials