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For the synthesis of white-light phosphor, red Eu3+ with different concentrations was co-doped into the blue LaPO4:Tm phosphor. It was found that the luminance at wavelength of 454 nm decreased gradually; on the contrary, reddish-orange emission at wavelength 594 nm was strengthened when the Eu3+ concentration was increased. The maximum red luminescent intensity was obtained when 7 mol% of Eu3+ was...
White-light organic light emitting diodes were fabricated and their electroluminescence properties were investigated. Fluorescent and phosphorescent hybrid emission layers were used to enhance the luminance and stability of the devices. It was found the organic layer structure maintained good carrier balance over a wide luminance range. Consequently, high stable in current efficiency was measured...
Photonic crystals are periodic dielectric structural materials that have photonic band gaps, and are divided into on-dimensional, two-dimensional, and three-dimensional structures based on their spatial distributions. One-dimensional photonic crystals have already found real-world applications. Three-dimensional photonic crystals are still in the experimental phase in laboratories. Due to their superior...
VP6- and NSP4- encoding genes of human group A rotavirus strain LL3354 with rare genotypes (G5P[6]), detected from China Lulong, was characterized by reverse transcription-PCR followed by sequencing and phylogenetic analysis. LL3354 joins the major cluster of SGI rotaviruses in the VP6 phylogenetic tree, However, It was identified as NSP4 genotype B. Our results provide evidence for independent segregation...
In this study, the ZnO phosphor was synthesized by solid-state sintering method. The powder of CeF3 was doped to study the influence of doping concentration, sintering time, and sintering temperature on the crystal structure, luminescence properties and surface morphologies of ZnO phosphor. The measurements of X-ray diffraction patterns, photoluminescence, and scanning electron microscope were used...
In this study, the ZnO phosphor was synthesized by solid-state sintering method. The powder of Eu2O3 was doped to study the influence of doping concentration, sintering time, and sintering temperature on the crystal structure, luminescence properties and surface morphologies of ZnO phosphor. The measurements of X-ray diffraction patterns, and photoluminescence were used to evaluate the crystallization,...
An anisotropic laser etching to the surface layer (n-GaN) of vertical-structured GaN-based light-emitting diodes (LEDs) associated with a transparent conducting layer (TCL) to release current crowding effect (CCE) for better light emission uniformity and higher optical efficiency is proposed and demonstrated. The theory behind the proposed scheme was verified by a two-dimensional device simulator...
A novel process for fabricating high-power Vertical-structure Metallic substrate GaN-based light-emitting diodes (VM-LEDs) employing selective nickel electroplating and patterned laser lift-off (LLO) techniques was proposed. Advantages including the avoidance of metal-cutting process, easy in die size definition through laser spot control, and simplification of fabrication processes (i.e., fewer masks...
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