Mechanisms of Energy Transfer and Enhanced Stability of Carbidonitride Phosphors for Solid-State Lighting
| Autor: | Anne Leugers, Lora Brehm, John B. Asbury, Michael M. Romanelli, Britt A. Vanchura, Andrew T. Heitsch, Hirsekorn Kurt F, Christopher Grieco, Mark H Mcadon, Anatoliy N. Sokolov, Alan C. Thomas |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Photoluminescence business.industry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Solid-state lighting Wavelength law Optoelectronics General Materials Science Emission spectrum 0210 nano-technology business Luminescence Spectroscopy Light-emitting diode |
| Zdroj: | ACS Applied Materials & Interfaces. 9:12547-12555 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Phosphor-converted light emitting diodes (pcLEDs) produce white light through the use of phosphors that convert blue light emitted from the LED chip into green and red wavelengths. Understanding the mechanisms of degradation of the emission spectra and quantum yields of the phosphors used in pcLEDs is of critical importance to fully realize the potential of solid-state lighting as an energy efficient technology. Toward this end, time-resolved photoluminescence spectroscopy was used to identify the mechanistic origins of enhanced stability and luminescence efficiency that can be obtained from a series of carbidonitride red phosphors with varying degrees of substitutional carbon. The increasing substitution of carbon and oxygen in nitrogen positions of the carbidonitride phosphor (Sr2Si5N8–[(4x/3)+z]CxO3z/2:Eu2+) systematically changed the dimensions of the crystalline lattice. These structural changes caused a red shift and broadening of the emission spectra of the phosphors due to faster energy transfer f... |
| Databáze: | OpenAIRE |
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