CAJ | 학술논문

通过高温固相反应合成 YVO4∶ xTm(x =0.001,0.003,0.005,0.007,0.01,0.03,0.05)蓝色系列粉末状发光材料。经 X 射线衍射分析产物为单相,属四方锆英石结构,其结果与 JCPDS 标准卡(72-0861)相符。检测了材料的真空紫外激发光谱和发射光谱。 YVO4∶ xTm 的真空紫外激发光谱在120~350 nm 范围内为连续的带状峰,在155 nm 和333 nm 附近有明显的峰值。在155 nm 激发下,YVO4∶ xTm 的发射光谱由两部分组成,其中主发射峰在474 nm 附近呈一尖锐的线状,来自 Tm3+的1 G4→3 H6跃迁；在650 nm 左右有一弱发射峰,来自Tm3+的1 G4→3 H4跃迁。另外,还有一较弱的带状发射,中心位于540 nm 左右,来自样品的 VO3-4离子的宽带发射。随着 Tm3+摩尔分数 x 由0.001增加到0.005,Tm3+发射光谱强度逐渐增加到最大值。之后随着 x 继续增加,发射光谱强度逐渐下降,呈现明显的浓度猝灭现象。通过对 YVO4∶ xTm 的光谱分析及其发光机理进行推导,认为 YVO4∶ Tm3+在紫外及真空紫外激发下,是一种具有较高发光效率以及色纯度较好的蓝色发光材料。
통과고온고상반응합성 YVO4∶ xTm(x =0.001,0.003,0.005,0.007,0.01,0.03,0.05)람색계렬분말상발광재료。경 X 사선연사분석산물위단상,속사방고영석결구,기결과여 JCPDS 표준잡(72-0861)상부。검측료재료적진공자외격발광보화발사광보。 YVO4∶ xTm 적진공자외격발광보재120~350 nm 범위내위련속적대상봉,재155 nm 화333 nm 부근유명현적봉치。재155 nm 격발하,YVO4∶ xTm 적발사광보유량부분조성,기중주발사봉재474 nm 부근정일첨예적선상,래자 Tm3+적1 G4→3 H6약천；재650 nm 좌우유일약발사봉,래자Tm3+적1 G4→3 H4약천。령외,환유일교약적대상발사,중심위우540 nm 좌우,래자양품적 VO3-4리자적관대발사。수착 Tm3+마이분수 x 유0.001증가도0.005,Tm3+발사광보강도축점증가도최대치。지후수착 x 계속증가,발사광보강도축점하강,정현명현적농도졸멸현상。통과대 YVO4∶ xTm 적광보분석급기발광궤리진행추도,인위 YVO4∶ Tm3+재자외급진공자외격발하,시일충구유교고발광효솔이급색순도교호적람색발광재료。
Series of blue phosphors YVO4∶ xTm (x = 0. 001, 0. 003, 0. 005, 0. 007, 0. 01, 0. 03, 0. 05) were synthesized by the high temperature solid state reaction in this paper. X-ray diffraction shows that the product is a tetragonal zircon structured single phase. The result is consistent with JCPDS standard card (72-0861). The vacuum UV excitation spectrum and emission spectra of the phosphors at room temperature were also detected. The vacuum UV excitation spectrum of YVO4 ∶xTm includes a continuous banded peak in the range of 120 - 350 nm, and there are two significant peaks at 155 nm and 333 nm. Excited by 155 nm, the emission spectrum of YVO4∶ xTm consists of two parts. The main emission spectrum at 474 nm is a sharp peak, caused by 1 G4→3 H6 transition of Tm3 + . The weaker emission peak is at 650 nm, which is generated by 1 G4→3 H4 transition of Tm3 + . In addition, there is a weak band emission centering around 540 nm, which presents broadband emission of VO3 -4 ions. With the increasing of Tm3 + mole fraction (x) from 0. 001 to 0. 005, the emission intensity gradually increases to a maximum value. Then, as x increases continuously, the emission intensity decreases gradually, presents an obvious concentration quench. By analyzing the spectra of YVO4∶ xTm and its luminescent mechanism, it can be derived that YVO4∶ Tm3 + is a kind of blue phosphor material with high luminous efficiency and color purity under ultraviolet or vacuum ultraviolet excitation.