掺杂二氧化镝晶体的生长与表征摘要：二氧化碲晶体（TeO2）是一种多功能晶体，已用于制备声光Q开关、偏转器、红外调至器、红外窗口和可调式滤波器件等各类器件中，广泛应用于激光打标、激光雕刻、扫描频谱分析、测速、测波长、色合成等众多高技术领域。虽然稀土掺杂的TeO2荧光粉具有较好的发光性能，但由于稀土掺杂TeO2晶体生长难度大，因而其发光性能鲜有报道。坩埚下降法是生长较高品质TeO2晶体的有效方法，本文通过调节生长工艺运用此方法成功生长出长度达到12。5cm的掺0。2mol%Dy3+的TeO2晶体，顶部有裂痕，有灰白色析出物，内部有散射颗粒，但等径主体部分及肩部为无色透明。Dy:TeO2晶体的荧光光谱中存在Dy3+离子外层4f电子能级跃迁产生的特征峰，并给出了简单的发光机理图。Dy:TeO2晶体的色谱图研究表明该晶体能够在348nm、387 nm紫外光激发下，发射出稳定的黄光；在363nm光激发下，能够直接发射白光；在453nm蓝光激发下，也能够得到稳定的黄光，从而有可能与蓝光复合得到白光。因此，Dy:TeO2晶体是一种有望用于白光LED的荧光单晶候选材料。80389

毕业论文关键词：白光LED；二氧化碲单晶；坩埚下降法；Dy3+掺杂

Growth and Characterization of Dy - doped TeO2 Crystal

Abstract：TeO2 is a versatile crystal that has been used in the preparation of acousto-optic Q switches, deflectors, infrared adjusters, infrared windows and adjustable filter devices, and is widely used in laser marking , Laser engraving, scanning spectrum analysis, speed, wavelength measurement, color synthesis and many other high-tech fields。 Although rare earth doped TeO2 phosphors have good luminescent properties, the rare earth doped TeO2 crystal is difficult to grow, so its luminescent properties are rarely reported。 The crucible descending method is an effective method to grow TeO2 crystals with high quality。 By using this method, the TeO2 crystals with 0。1mol% Dy3 + length have a diameter of 12。5cm。 The tops are cracked and have white precipitates。 Scattering particles, but the diameter of the main part and the shoulder colorless and transparent。 Dy: TeO2 crystal fluorescence spectrum exists Dy3 + ion outer layer 4f electron energy level transition characteristics of the peak, and gives a simple light emission mechanism。 The chromatogram of Dy: TeO2 crystal shows that the crystal can emit stable yellow light at 348nm and 387nm ultraviolet light。 Under the excitation of 363nm, it can emit white light directly。 Under 453nm blue light excitation, it can be stabilized Of the yellow, which may be combined with the blue light to get white。 Therefore, Dy: TeO2 crystal is a kind of fluorescent single crystal candidate material which is expected to be used for white LED。

Key words: White light LED; tellurium single crystal; crucible descent method; Dy3 + doping;

目录

一、引言 1

二、研究背景、意义 1

2。1 荧光单晶 1

2。2 TeO2单晶 2

2。3 Dy3+稀土离子发光 3

2。4 TeO2单晶的生长方法 3

2。4。1提拉法生长 3

2。4。2 坩埚下降法生长 4

2。5掺杂TeO2单晶生长的难点 5

2。6 选题依据及研究内容 6

三、实验部分 7

3。1 实验材料及仪器