Publications by authors named "Pham Minh Tri"
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.
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- Near-ultraviolet (NUV)-pumped white light-emitting diodes (WLEDs) require efficient cyan phosphors to improve color rendering in the 480-520 nm range, which is currently a challenge.
- Researchers synthesized effective cyan-emitting ZnS/ZnO phosphors using a high-energy planetary ball milling method and post-annealing, resulting in strong cyan emissions and excellent thermal stability.
- A prototype cyan LED was developed that achieved high quantum efficiency and promising chromatic coordinates, showcasing ZnS/ZnO materials as viable, non-toxic alternatives to rare-earth phosphors for enhancing full-spectrum white LEDs in solid-state lighting.
Surface functionalized nano-magnetic particles for wastewater treatment: adsorption and desorption of mercury.
J Nanosci Nanotechnol
February 2009
The present study deals with adsorption and desorption of mercury on surface functionalized nano-magnetic particles. The nano-magnetic particles (Fe3O4) were synthesized by chemical precipitation of Fe2+ and Fe3+ salts at 80 degrees C at alkaline condition and inert atmosphere. The particle surface was then functionalized in two different ways: surface charge controlled by solution pH and coating the surface with polymer (vinylpyrrolidone) with thiodiglycolic acid as the primary surfactant and 4-vinylaniline as the secondary surfactant.
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