Blue Emission by Interstitial Site Occupation of Ce3+ in AlN

Tzu-Chen Liu, Hiroko Kominami, Heather F. Greer, Wuzong Zhou, Yoichiro Nakanishi, Ru-Shi Liu

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53 Citations (Scopus)

Abstract

An AlN phosphor that was coactivated by Ce3+ and Si4+ ions was synthesized by gas pressure sintering (GPS) at 2050 degrees 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 Ce3+ ions are much larger than that of Al3+ 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.

Original languageEnglish
Pages (from-to)3486-3492
Number of pages7
JournalChemistry of Materials
Volume24
Issue number17
DOIs
Publication statusPublished - 11 Sept 2012

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