The effect of calcium concentration on the photoluminescence of CaTiO3: Pr3+ films prepared by the sol-gel method

被引：8

作者：

Yuan, Xiaofang ^{[1
,2
]}

Shen, Mingrong ^{[1
,2
]}

Fang, Liang ^{[1
,2
]}

Zheng, Fengang ^{[1
,2
]}

Wu, Xinglong ^{[3
,4
]}

Shen, Jiancang ^{[3
,4
]}

机构：

[1] Soochow Univ, Jiangsu Key Lab Thin Films, Suzhou 215006, Peoples R China

[2] Soochow Univ, Dept Phys, Suzhou 215006, Peoples R China

[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[4] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

来源：

OPTICAL MATERIALS | 2009年 / 31卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Sol-gel; Photoluminescence; CaTiO3; Pr3+; RED LUMINESCENCE; ENHANCEMENT; PHOSPHOR; IMPROVEMENT; AFTERGLOW; BEHAVIOR;

D O I：

10.1016/j.optmat.2009.01.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ca1-x+yPrxTiO3 (CPTO) films with x = 0.25 mol% and different y values were prepared by the sol-gel method. Both Ca excess and deficiency were found to be effective to improve the red emission brightness of the CPTO films, while they have small effect on the surface roughness and grain sizes of the films. The highest red emission at 612 nm for the case of Ca2+ deficiency happened on y = -x/2, and the one for the case of Ca2+ ions excess was on y = 3x. Charge compensation and substitution of Pr3+ for Ti4+ when Ca 21 ions was excessive in the CPTO films were proposed to explain the experimental results. These results indicate that the traditionally adopted Ca deficiencies may not be the best one for the efficient red emission of CPTO films, instead, a proper Ca excess is more effective. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1248 / 1251

页数：4

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