Blue Emission by Interstitial Site Occupation of Ce³⁺in AlN

Abstract

An AlN phosphor that was coactivated by Ce 3+ and Si 4+ ions was synthesized by gas pressure sintering (GPS) at 2050 °C for 4 h in a 0.92 MPa nitrogen atmosphere. The phosphor emits blue color with the Commission International de l'Eclairage (CIE) chromaticity coordinate of (0.15, 0.07), which is close to the National Television Standard Committee (NTSC) blue coordinate. The crystallization and cell parameters of the samples were investigated by Rietveld refinement and high-resolution transmission electron microscopy (HRTEM). Since the ionic size of Ce 3+ ions are much larger than that of Al 3+ ions, the locations of rare earth (RE) ions in the AlN lattice are unclear. An octahedral interstitial site inside the wurtzite structure is proposed to be the site for RE ions. The effect of Si substitution was verified by energy-dispersive X-ray spectroscopy (EDX) and solid-state nuclear magnetic resonance (ssNMR). Cathodoluminescence (CL) was examined under electron bombardment at different accelerating voltages. Nitride phosphor exhibited high brightness and favorable stability. This study reveals the superior characteristics of nitride compounds in field emission display (FED) applications.

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

“…Therefore, its amount is very low and the influence of it on structure and optical properties can be ignored. The high Si-N concentration of Al 10 [17]. Later, it is experimentally observed that Ce is actually incorporated inside [17].…”

Blue-silica by Eu2+-activator occupied in interstitial sites

“…14 McCrate et al also presented that the intrinsic oxygen vacancy defect (OVD) on planar fused silica was experimentally detected by titration with fluorescent probe molecules, such as perylene-3methanamine and 3-vinyl perylene. 18 Blue emission by Ce 3+ ions occupied in the interstitial site of AlN structure was reported by Liu et al 19 According to their results, an octahedral interstitial site of the AlN compound with würtzite structure was proposed to be the site for Ce 3+ ions because the ionic size of Ce 3+ ions is much larger than that of Al 3+ . It should be noted that there is an interstitial sites formed structurally in the crystal lattice of α-quartz (or.…”

Red-emittingAlN:Mn2+phosphors prepared by combustion synthesis

“…1 Among them, aluminum nitride (AlN) has been studied as a new class of nitride host for the phosphors owing to its wide bandgap (6.2 eV), high thermal conductivity and high stability. 1,2 To date, activators such as rare-earth [3][4][5][6][7][8] and Mn 9,10 doped AlN phosphors have been reported for utilization in LEDs and FEDs. Especially, AlN:Mn is one of the promising phosphor because it can emit bright orangered color owing to the transition of 3d-electrons in a Mn ion.…”

“…Therefore, the critical distance was calculated to be 11 Å, which is close to the typical value of R c (15 Å), indicating that the incorporation of Mn 2þ ions in the AlN host should be involve substitution of the ions of the host lattice. 8 The CIE chromaticity diagram of AlN:3%Mn 2þ phosphor is shown in Fig. 6.…”