Dual role of oxygen-related defects in the luminescence kinetics of AlN:Mn²⁺

Abstract

This study presents the impact of temperature and pressure on AlN:Mn2+ luminescence kinetics.

Eu2+ and Mn2+ co-doped Lu2Mg2Al2Si2O12 phosphors for high sensitivity and multi-mode optical pressure sensing

“…38,39 The energy levels of Mn 2+ ions can be represented by the Tanabe–Sugano diagram. 40,41 The positions of the energy levels are determined by the Racah parameters B and C and the crystal field splitting degree ( D q ), 18,34 which can be specifically calculated from the energy levels of the excitation spectra in Fig. S6† and the following equations: 40 6A 1 ( 6 S) → 4 E( 4 D) = 17 B + 5 C 6A 1 ( 6 S) → 4 A 1 , 4 E( 4 G) = 10 B + 5 C 6A 1 ( 6 S) → 4 T 2 ( 4 G) = −10 D q + 18 B + 6 C − (38 B 2 /10 D q )…”

Review—Photoluminescence Spectroscopy of Mn2+-Activated Phosphors: Part II. Some Representative Phosphors

“…The experimental data are taken from Ref. 29. The vertical bars on the PL spectra show the best-fit results using Eq.…”

“…30). However, the X-ray diffraction pattern of the sample revealed the well-known AlN hexagonal wurtzite phase, 29 which usually has the larger band-gap energy (∼6 eV; Ref. 30) than c-AlN.…”

Opposite pressure impact on electron–phonon coupling in Eu2+ and Ce3+ doped AlN

“…The advantages of AlN include a wide band gap (6.2 eV), high thermal conductivity, and high chemical and thermal stabilities. To date, the AlN host doped with various activators such as trivalent Er, 1 Gd, 2 Cr, 3 Eu, Tb, 4 Pr, 5 Ho, 6 and Ce, 7 and divalent Eu 8,9 and Mn 7,10,11 has been researched. Until recently, it was not clear where these luminescent ions are located in the wurtzite AlN lattice, as there is not enough space for a large cation to occupy the tetrahedral Al 3+ sites.…”