A novel inequivalent double-site substituted red phosphor Li4AlSbO6:Mn4+with high color purity: its structure, photoluminescence properties, and application in warm white LEDs

Zhiyuan Li, Xuhui Zhang, Ji Wu, Rui Guo*, Lan Luo, Yuhua Xiong, Li Wang, Wei Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Non-rare-earth Mn4+-doped oxide red phosphors have received increasing attention in the field of white light-emitting diodes (LEDs) for their admirable chemical stability and spectral properties. Here, a new inequivalent double-site substituted Mn4+-doped Li4AlSbO6(LAS:Mn4+) phosphor with deep-red emission was successfully synthesizedviathe conventional solid-state reaction method. X-ray powder diffraction (XRD) and Rietveld refinement analysis confirm that LAS is isostructural with Li4MnSbO6, belonging to the monoclinic system with a space group ofC2/c. The LAS:Mn4+phosphor has two inequivalent Mn4+luminescence centers situated at the Al3+and Sb5+sites, respectively, and two intense and broad excitation bands in the near-ultraviolet (n-UV, ∼397 nm) and blue (∼467 nm) regions, indicating that it is very suitable for being excited with commercial n-UV and blue LED chips. Under 467 nm excitation, the phosphor emits bright red light centered at 673 nm with a high color purity of over 99%, originated from the2Eg4A2gtransition of Mn4+ions. The optimal content of Mn4+in LAS is 0.5 mol% and its corresponding quantum yield is nearly 40%. Furthermore, it also has good thermal stability with an activation energy of 0.52 eV. A white LED device fabricated with the as-prepared LAS:Mn4+phosphor exhibits a low correlated color temperature (CCT = 3534 K) and a high color rendering index (CRI = 81.4), implying that LAS:Mn4+is a promising red phosphor for warm white LEDs.

Original languageEnglish
Pages (from-to)13236-13246
Number of pages11
JournalJournal of Materials Chemistry C
Volume9
Issue number38
DOIs
Publication statusPublished - 14 Oct 2021
Externally publishedYes

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