Dual deep red and far red emitting Cr-doped garnet-perovskite based phosphors with excellent responsiveness to P for plant growth LED lighting.

Cr-activated phosphors, with their 3d electronic configuration, efficiently absorb blue/violet light and emit deep to far-red wavelengths, perfectly matching the optimal absorption bands for plant growth. In this work, we report the synthesis of YAlO-YAlO:1.3%Cr (YAG-YAP:Cr) phosphors exhibiting a broad emission spanning deep to far-red light, closely aligned with the far-red phytochrome (P) absorption spectrum in plants.

Broadly tunable full-visible-spectrum ZnS/ZnO:Mn composite microphosphor for warm WLED applications.

Phosphor development for warm white LEDs (w-WLEDs) is key to enhancing light quality, energy efficiency, stability, and environmental sustainability. Mn-doped phosphors, known for their broad visible emission, are especially promising for UV-pumped w-WLEDs. While halide and garnet systems show potential, they suffer from toxicity and complex synthesis, making ZnO and ZnS attractive, stable alternatives.

Unlocking dual Mn/Mn emissions in garnet phosphors for WLED and plant growth lighting applications.

Garnet-based lattices (ABO) have emerged as promising hosts for Mn co-doping due to their wide band gap and robust mechanical properties. However, challenges in stabilizing Mn, balancing Mn/Mn emissions, and optimizing synthesis for thermal stability and efficiency have limited practical applications. In this study, GdGaO (GGG) garnet was synthesized with Mn and Mn co-doping a simple solid-state reaction.

The kinetics of a light irradiation enhanced room temperature NO gas sensor using hybrid ZnO/ZnTe nanorod structures.

This study focuses on fabricating a hybrid structure consisting of ZnO nanorods and ZnTe nanoparticles for NO gas detection, particularly exploring the impact of light irradiation at room temperature (RT). The morphology, physical characteristics, and chemical properties of the ZnO/ZnTe hybrid structure are carefully studied under diverse analytical methods such as X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and other measurements. The ZnO/ZnTe composite displayed an improved response toward 500 ppb NO under the blue light radiation effect.

Enhanced Responsivity and Photostability of CsBiI-Based Self-Powered Photodetector via Chemical Vapor Deposition Engineering.

Lead-based halide perovskites have gained significant prominence in recent years in optoelectronics and photovoltaics, owing to their exceptional optoelectronic properties. Nonetheless, the toxicity of lead (Pb) and the stability concern pose obstacles to their potential for future large-scale market development. Herein, stable lead-free CsBiI (CBI) films are presented with smooth and compact morphologies synthesized via chemical vapor deposition (CVD), demonstrating their application as an UV photodetector in a self-powered way.

Promising deep-red emitting Cr-doped SrAlO phosphors for plant growth LEDs.

Recently, deep-red-emitting phosphors that can be excited by ultraviolet (UV) and near-ultraviolet (NUV) light have been extensively investigated for plant growth LED applications. However, due to the harmful effects of these high-energy rays on plants, violet- or blue-excited deep-red-emitting phosphors are considered a more appropriate solution. In this work, SrAlO:Cr phosphors were synthesized using a simple solid-state reaction, revealing a strikingly sharp deep-red emission band centered at 694 nm and effective excitation by violet light.

High quantum efficiency and excellent color purity of red-emitting Eu-heavily doped Gd(BO)-YBO-GdBO phosphors for NUV-pumped WLED applications.

Eu-doped phosphors have been much attractive owing to their narrow-band red emission peak at 610-630 nm with high color purity; however, the weak and narrow absorption band in the NUV region limits their applications. Doping a higher amount of Eu ions into a non-concentration quenching host could be key to enhancing the efficiency of the absorption value and emission intensity. Hence, the design of Eu-heavily doped phosphors with a suitable host lattice is key for applications.

Highly efficient green-emitting ZnO:Cu phosphors for NUV-pumped white-emitting diodes.

Phosphor-converted white light-emitting diodes (WLEDs) have received significant attention; however, the leaked light from their blue InGaN chips has an undesirable effect on human health. Hence, it is necessary to develop red, green, and blue-emitting phosphors, which can be excited by an NUV chip instead of a blue chip. Herein, green-emitting ZnO:Cu phosphors have been successfully synthesized by a simple and facile thermal diffusion method.

A high quantum efficiency plant growth LED by using a deep-red-emitting α-AlO:Cr phosphor.

Although it has been extensively studied for decades, the α-AlO:Cr phosphor has rarely been investigated for horticultural lighting. In this work, for the first time, a prototype of a plant growth light-emitting diode (LED) has been fabricated by coating a deep-red-emitting α-AlO:Cr phosphor onto a near-ultraviolet (NUV) chip. The α-AlO:Cr phosphor, synthesized by a co-precipitation method and annealed at 1500 °C for 2 h, emits an outstanding narrow peak at 695 nm.