Particle-swarm-optimization-assisted rate equation modeling of the two-peak emission behavior of non-stoichiometric CaAlxSi(7-3x)/4N3:Eu2+ phosphors

被引：49

作者：

Jung, Yoon Won ^{[1
]}

Lee, Bonghyun ^{[1
]}

Singh, Satendra Pal ^{[1
]}

Sohn, Kee-Sun ^{[1
]}

机构：

[1] Sunchon Natl Univ, World Class Univ Program, Dept Printed Elect, Chungnam 540742, South Korea

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 17期

关键词：

ENERGY-TRANSFER PROCESSES; EU-DOPED CAALSIN3; ORGANIZED MEDIA; LUMINESCENCE PROPERTIES; CRYSTAL MODEL; 5D-LEVEL ENERGIES; CE3+; NITRIDE; PHOTOLUMINESCENCE; ENVIRONMENT;

D O I：

10.1364/OE.18.017805

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We examined non-stoichiometric CaAlxSi(7-3x)/4N3:Eu2+ phosphors that were intentionally prepared with x = 0.7 similar to 1.3 to identify the origin of the deconvoluted Gaussian components that constitute the emission spectra of stoichiometric CaAlSiN3:Eu2+ phosphors. The Al/Si molar ratio around the Eu2+ activator caused the deconvoluted Gaussian peaks. The Eu2+ activator sites in Al-rich environments gave rise to the lower-energy emission peak, while those in Si-rich environments were related to the higher-energy emission peaks. Active energy transfer from the Eu2+ activator site in the Si-rich environment to the Eu2+ activator site in the Al-rich environment was confirmed. Particle swarm optimization was employed to estimate the nine unknown decision parameters that control the energy transfer process. All of the decision parameters were estimated within the range of reasonable values. (C) 2010 Optical Society of America

引用

页码：17805 / 17818

页数：14