A STUDY OF RED-EMITTING PHOSPHOR OF K2SiF6:Mn4+ FOR WARM WHITE LEDs

Abstract

This study focuses on the fabrication of red-emitting phosphor based on K₂SiF₆: Mn⁴⁺ phosphor. Characteristic emissive peaks in the red region of the Mn⁴⁺ ions involve the energy transfer from spin-forbidden states of ²E_g → ⁴A₂, showing narrow band emission peaks at 609, 614, 631, 635 and 647 nm. Meanwhile, their absorptive peaks involve the energy transfer from spin-allowed states of ⁴A₂ → ⁴T_g; the excited wavelength of the Mn⁴⁺ is in the range 360 - 460 nm. Thus, the K₂SiF₆: Mn⁴⁺ phosphor is particularly suitable for redundancy of 460 nm - Light Emitting Diode (LED); it complements the red emission of the commercial White LEDs.