Host-sensitized white light-emitting phosphor MgY4Si3O13:Dy3+ with satisfactory thermal properties for UV-LEDs

Abstract

A single-phase white-light emitting phosphor MgY₄Si₃O₁₃:Dy³⁺ was synthesized using the solid state method under reducing atmosphere and in air for the first time. Upon ultraviolet light excitation, the phosphor exhibits intense warm white light emission with optimal CIE chromaticity coordinates of 0.432 and 0.421 and a correlated color temperature value of 3160 K. The emission intensities of samples synthesized under the reducing atmosphere are superior to those in air due to the sensitization of host to Dy³⁺. With the increase in temperature, MgY₄Si₃O₁₃:Dy³⁺ presents satisfactory thermal properties and based on the configurational coordinate diagram, the energy transfer mechanism between the host and Dy³⁺ is carefully investigated. All the results indicate that MgY₄Si₃O₁₃:Dy³⁺ could be a promising phosphor for warm white UV-LEDs.