Photoluminescence Properties of Sr2+ Doped Ca2Nb2O7：Eu3+ Red-emitting Phosphor

GENG Juan; TIAN Lian-hua

doi:10.3788/fgxb20143508.0945

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Photoluminescence Properties of Sr²⁺ Doped Ca₂Nb₂O₇：Eu³⁺ Red-emitting Phosphor

更新时间：2020-08-12

- Photoluminescence Properties of Sr²⁺ Doped Ca₂Nb₂O₇：Eu³⁺ Red-emitting Phosphor
- Chinese Journal of Luminescence Vol. 35, Issue 8, Pages: 945-949(2014)
- 作者机构：
  
  延边大学理学院物理系, 吉林延吉,133002
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20143508.0945
  CLC： O482.31
- Received：02 May 2014，
  
  Revised：03 June 2014，
  
  Published：03 August 2014
- 稿件说明：
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耿娟, 田莲花,. Sr2+掺杂荧光粉Ca2Nb2O7：Eu3+的发光特性[J]. 发光学报, 2014,35(8): 945-949

GENG Juan, TIAN Lian-hua,. Photoluminescence Properties of Sr2+ Doped Ca2Nb2O7：Eu3+ Red-emitting Phosphor[J]. Chinese Journal of Luminescence, 2014,35(8): 945-949
耿娟, 田莲花,. Sr2+掺杂荧光粉Ca2Nb2O7：Eu3+的发光特性[J]. 发光学报, 2014,35(8): 945-949 DOI： 10.3788/fgxb20143508.0945.

GENG Juan, TIAN Lian-hua,. Photoluminescence Properties of Sr2+ Doped Ca2Nb2O7：Eu3+ Red-emitting Phosphor[J]. Chinese Journal of Luminescence, 2014,35(8): 945-949 DOI： 10.3788/fgxb20143508.0945.

摘要

采用高温固相法制备出Ca

1.97-

：3%Eu

（

=0.10，0.50，1.0，1.5，1.97）红色荧光粉，研究了Ca

1.97-

：3%Eu

的发光特性及Sr

的浓度对该荧光粉发光性质的影响。随着Sr

浓度的改变，Ca

：Eu

的XRD呈现不同的相。Ca

1.97

：3%Eu

（

=0）的激发光谱中，302 nm附近的强宽带来自于O

电荷转移跃迁，272 nm附近的肩峰来自于NbO

基团的电荷转移跃迁，350~600 nm范围内的锐锋属于Eu

的特征4f-4f组内跃迁。在398 nm激发下，发射光谱的最强峰位于616 nm，属于Eu

的

电偶极跃迁，发射出强烈的红光。当Ca

逐渐被Sr

取代时，Ca

：Eu

的各激发峰的强度先提高后降低，且O

电荷转移跃迁发生明显红移。少量Sr

的掺杂可以有效提高Ca

：Eu

的红光发射强度，当

=0.01时该荧光粉的红光发射达到最强，可以被紫外LED芯片激发。

Abstract

doped Ca

:Eu

red-emitting phosphors were synthesized by a high temperature solid-state reaction. The photoluminescence properties of Ca

1.97-

:3%Eu

(

=0.10

0.50

1.0

1.5

1.97) and the effect of Sr

concentration on this phosphor were investigated. X-ray diffraction patterns of Ca

1.97-

:3%Eu

show several compositional phase transformations with different Sr

concentration. The excitation spectrum of Ca

1.97

: 3%Eu

(

=0) exhibits a broad band centered at 302 nm corresponding to the charge transfer (CT) transition of O

. The shoulder peak at 272 nm is attributable to CT transition of NbO

. The excitation spectrum also shows several sharp lines of f-f transitions of Eu

from 350 to 600 nm. Excited by 398 nm

1.97

:3%Eu

shows an intense red-emitting originated from

transition of Eu

at 616 nm. The intensities of the excitation peaks of Ca

1.97-

:3%Eu

are enhanced firstly and then decrease with the increasing of Sr

content. The CT transitions of O

have a red shift with the increasing of Sr

content. The doping of a small amount of Sr

can enhance the red-emitting of Ca

1.97

:3%Eu

and the optimum content is

=0.01. The results indicate that Ca

1.97-

:3%Eu

may become a candidate for ultra-violet chip pumped and multi-phosphors converted white LEDs.

关键词

Keywords

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