Luminescent property and mechanism of ZnAl₂O₄ ultraviolet emitting phosphor

Abstract

ZnAl2O4 ultraviolet (UV) emitting phosphor has been studied for next‐generation ultraviolet emission device. In this work, to investigate the mechanism of ZnAl2O4, the phosphor was evaluated and analyzed using various methods. It is thought that the optimum ratio of source materials to obtain the single phase of ZnAl2O4 is 0.975. UV emission peak of ZnAl2O4 was changed from around 250 nm to 270 nm and the absorption edge was shifted to lower energy as increase the ratio of source materials. It is thought that bandgap of ZnAl2O4 became narrower as increase the ratio of source materials. From the results of annealing in active carbon, it became clear that the UV emission from ZnAl2O4 was caused oxygen vacancy. Additionally, from the results of sterilization examination, it is thought that the properties of ZnAl2O4 are promising for using it as candidate for sterilization. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Optimization of Zn2SiO4 Anode Structure for Deep Ultraviolet Generation With Carbon Nanotube Emitters

“…As reported by Oto et al, aluminum nitride based quantum wells were used as an anode material to make a wavelength of 240 nm [14]. Ishinaga et al controlled the composition ratio of ZnAl 2 O 4 to obtain deep UV emission peak of 250 to 270 nm [15]. We obtained deep UV with wavelengths of 208, 226 and 244 nm using Zn 2 SiO 4 and C-beam pumping technology [16].…”

Фотоактивные Cu-содержащие нанокомпозиты ZnO-ZnAl-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=-

“…По литературным данным ( [24,37,[48][49][50]), значения ширины запрещенной зоны этих кристаллов, полученных различными методами, варьируются в широких пределах -от 3.9 до более 6.0 eV. Однако в [39,51] была показана возможность использования ZnAl 2 O 4 в качестве люминофора, излучающего свет, под действием жесткого УФ излучения (λ exc < 200 nm), в УФ-C спектральном диапазоне, что свидетельствует о том, что ZnAl 2 O 4 является широкозонным материалом.…”

Quantum mechanical modeling of Zn‐based spinel oxides: Assessing the structural, vibrational, and electronic properties

“…[ 3,19–21 ] However, the luminescence behavior of ZnAl 2 O 4 nanoparticles will be more specific due to the change of energy band‐gap and defects in the size of particles. [ 22,23 ] Fortunately, ZnAl 2 O 4 is currently an alternative material for hydrogen generation. [ 7 ]…”

“…[3,[19][20][21] However, the luminescence behavior of ZnAl 2 O 4 nanoparticles will be more specific due to the change of energy band-gap and defects in the size of particles. [22,23] Fortunately, ZnAl 2 O 4 is currently an alternative material for hydrogen generation. [7] ZnGa 2 O 4 is also an AB 2 O 4 spinel-type crystal structure, has received extensive attention from researchers as a good luminescent material matrix, and shows various emission colors when doped with different transition metal ions or rare-earth ions, such as Cr 3+ .…”