Synthesis and photoluminescence properties of high color purity red emitting Li2MgTi3O8:Eu3+ phosphors for warm W-LEDs

Abstract

In search of efficient and suitable phosphors for white light emitting diodes (w -LEDs), herein, we report Li2MgTi3O8:Eu3+ as red phosphors that are low-cost eco-materials synthesized by solid-state reaction method. XRD patterns confirm the crystallinity and phase purity of the as-prepared phosphors with the successful incorporation of Eu3+ ions. FTIR, FE-SEM and TEM were used to understand the functional groups and morphology of prepared samples respectively. The band gap energy calculated from DRS showed Burstein–Moss effect. Under 398 nm excitation, intense red emission was recorded at 615 nm and lifetime values were in microsecond range. The prepared phosphor possesses quantum efficiency of 31.74%, good thermal stability with an activation energy of 0.254 eV and exhibit warm red emission with 100% color purity. Therefore, the obtained results suggests that the prepared Li2MgTi3O8:Eu3+ phosphors can be considered as an appropriate candidate for the red component in w- LEDs.