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Erschienen in:
21.05.2016
NUV excited luminescence of Eu3+ doped inorganic NaCa0.5Al2B2O7 phosphor via slow evaporation technique
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 9/2016
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Abstract
A series of red-emitting alumino-borate phosphors (NCABO) with chemical composition of NaCa0.5Al2B2O7:xEu3+ (0.5–4 mol%) has been synthesized by using slow evaporation technique. X-ray diffraction (XRD), FE-SEM and photoluminescence measurements were performed to testify the crystal structure, surface morphology and luminescent properties. The present phosphor exhibits a strong broad absorption in the near ultraviolet (n-UV) (~395 nm), which is matched well with the emission wavelength of n-UV LED chip. The most intense red emission was found at ~616 nm when doped Eu3+ content was 3 mol%. All the samples show the characteristic red emission of Eu3+ ions (5D0 → 7FJ, J = 0, 1, 2, and 3), suggesting that the phosphor is competitive as a promising red-emitting phosphor for n-UV light-emitting diodes (LEDs). The optimal Eu3+ concentration was determined, and the mechanism of the concentration quenching was predominated by dipole–dipole interaction.