In the present study, evolution of apple color (L* and a/b), the accumulation of anthocyanins and the activity of the related enzymes, phenylalanine ammonia-lyase (PAL), chalcone isomerase (CHI), dihydroflavonol4-reductase (DFR) and UDP-Glucose: flavonoid-3-O-galactosyl transferase (UFGT), were investigated in bagged non-red apple cultivars (‘Granny Smith’ and ‘Golden Delicious’) and red apple cultivars (‘Starkrimon’ and ‘Pink Lady’). Young fruits were bagged 40–45 days after flowering (DAF), and fruits of ‘Golden Delicious’ and ‘Starkrimon’ were uncovered and exposed to light 120 DAF, while those of ‘Granny Smith’ and ‘Pink Lady’ were exposed for 160 DAF. Results showed that cyanidin 3-galactoside (cy3-gal) was the most abundant anthocyanin in both non-red and red cultivars. Level of anthocyanins was higher in ‘Granny Smith’ than in ‘Golden Delicious’, indicating that red color was easier to develop in green cultivar ‘Granny Smith’ than in yellow cultivar ‘Golden Delicious’ after bag removal. The cy3-gal accumulation of non-red cultivars tested was not significantly correlated with PAL, CHI and DFR activity, but was significantly correlated with UFGT activity. During the reddening of non-red apples, UFGT may be the more important factor in the anthocyanin biosynthesis.
Intractable hurdles
of low Coulombic efficiency and dendritic Li formation during a repeated
deposition/stripping process hinder the commercial use of Li
metal anode for next-generation battery systems. Achieving uniform
Li nucleation is one of the effective strategies to address these
issues, and it is of practical importance to realize this on a commercial
Cu current collector that is lithiophobic. Herein, we design a nanostructured
Ag lithiophilic layer on a Cu foil via an electroless plating process
for a Li metal current collector. The deposition of lithiophilic Ag
particles that are homogeneously distributed on the Cu foil can reduce
the nucleation overpotential, realizing uniform Li nucleation and
subsequently flat Li plating. As a result, a stable cycle stability
of up to 360 h (1 mA cm–2) and an average Columbic
efficiency of 94.5% for 100 cycles (1 mA cm–2) are
achieved. Furthermore, CuAg full cells with LiFePO4 as
a cathode exhibit good cycle performances and low polarization voltage.
This approach provides another facile way for a stable lithium metal
anode.
0D hybrid metal halides (0D HMHs) are considered to be promising luminescent emitters. 0D HMHs commonly exhibit self‐trapped exciton (STE) emissions originating from the inorganic metal halide anion units. Exploring and utilizing the emission features of the organic cation units in 0D HMHs is highly desired to enrich their optical properties as multifunctional luminescent materials. Here, tunable emissions from organic and inorganic units are successfully achieved in triphenylsulfonium (Ph3S+)‐based 0D HMHs. Notably, integrated afterglow and STE emissions with adjustable intensities are obtained in (Ph3S)2Sn1−xTexCl6 (x = 0–1) via the delicate combination of [SnCl6]2− and [TeCl6]2−. Moreover, such a strategy can be readily extended to develop other HMH materials with intriguing optical properties. As a demonstration, 0D (Ph3S)2Zn1−xMnxCl4 (x = 0–1) are constructed to achieve integrated afterglow and Mn2+ d–d emissions with high efficiency. Consequently, these novel 0D HMHs with colorful afterglow and STE emissions are applied in multiple anti‐counterfeiting applications.
Self‐trapped exciton (STE) emission in some metal halides has acquired great interest in recent years due to their broadband emission, large Stokes shift, and high photoluminescence quantum yield (PLQY). However, severe thermal quenching of STE emission is still a critical bottleneck that impedes their application in light‐emitting field. Herein, a novel zero‐dimensional hybrid metal halide, Sb3+‐doped (BTPP)2MnCl4 (BTPP = Benzyltriphenylphosphonium), is accordingly synthesized to address this issue. This compound exhibits excitation‐dependent dual emissions including STE emission of antimony chloride tetrahedron and 4T1‐6A1 transition of Mn2+ ions, resulting in a tunable emission color from green to orange. More importantly, the PL intensity of STE emission at 420 K in (BTPP)2MnCl4:2.0%Sb can maintain 72.5% of its ambient value, which is superior to current organic–inorganic hybrid metal halides. Temperature‐dependent and time‐resolved spectroscopy results suggest that the high thermal stability of STE emission originates from the efficient energy transfer from (BTPP)2MnCl4 host to antimony chloride tetrahedron, which promotes the formation of STEs. The white light‐emitting diode based on this (BTPP)2MnCl4:2.0%Sb phosphor exhibits high‐performance warm white light with a correlated color temperature of 4827 K and a color rendering index of 88.7, which demonstrates its potential in solid‐state lighting applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.