Near-UV and blue wavelength excitable Mg0.6Ca2.16Mo0.2W0.8O6: Eu-0.12(3+)/Na-0.12(+) high efficiency red phosphors

作者：Khanna A; Dutta P S^*

来源：Journal of Solid State Chemistry, 2015, 225: 120-134.

DOI：10.1016/j.jssc.2014.12.008

• Crystal structure
• Charge compensation
• Narrow line-width
• Red phosphors
• White LEDs
• Charge transfer band

Red phosphors with narrow emission around 615 nm (with FWHM similar to 5-10 nm) having chemical compositions of A(0.6)Ca(2.16)Mo(0.2)W(0.8)O(6): Eu-0.12(3+)/Na-0.12(+) (A=Mg, Sr) have been found to exhibit the highest luminescence amongst the molybdate-tungstate family when excited by sources in the 380-420 nm wavelength range. Thus they are most suitable for enhancing color rendering index and lowering color temperature in phosphor converted white LEDs (pc-WLEDs) with near-UV/blue LED excitation sources. The excitation band edge in the near UV/blue wavelength in the reported phosphor has been attributed to the coordination environment of the transition metal ion (Mo6+, W6+) and host crystal structure. Furthermore the quantum efficiency of the phosphors has been enhanced by adjusting activator concentration, suitable compositional alloying using substitutional alkaline earth metal cations and charge compensation mechanisms.

• 出版日期2015-5