Photoluminescence properties and application of yellow Ca0.65Si10Al2O0.7N15.3:xEu2+ phosphors for white LEDs
Abstract A series of yellow-emitting oxynitride Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 : x Eu 2+ phosphors with α-sialon structure were synthesized. The phase composition and crystal structure were identified by X-ray diffraction and the Rietveld refinement. The excitation and emission spectra, reflectance spectra and thermal stability were investigated in detail, respectively. Results show that Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 :0.12Eu 2+ phosphors can be efficiently excited by UV-Vis light in the broad range of 290–450?nm and exhibit broad emission spectra peaking at 550–575?nm. The concentration quenching mechanism are discussed in detail and determined to be the dipole-dipole interaction. When the temperature increased to 150?°C, the emission intensity of Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 :0.12Eu 2+ phosphor is 88.46% of the initial value at room temperature. White LED was fabricated with N-UV LED chip combined with blue Ca 3 Si 2 O 4 N 2 :Ce 3+ and yellow Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 :Eu 2+ phosphors. The color rendering index and correlated color temperature of this white LED were measured to 78.94 and 6728.12?K, respectively. All above results demonstrate that the as-prepared Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 : x Eu 2+ may serve as a potential yellow phosphor for N-UV w-LEDs. Highlights New element proportion Ca 0.65 Si 10 Al 2 O 0.7 N 15.3 that has never been reported. Comprehensive comparison with commercial yellow YAG:Ce 3+ phosphor. Evaluation of practicality by encapsulating w-LED with 2-phosphor-conversion method. Graphical abstract [DISPLAY OMISSION]
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- DOI : http://dx.doi.org/10.1016/j.solidstatesciences.2016.12.018
- Elsevier : 저널> 권호 > 논문
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