摘要

硫化鋅（ZnS）具有寬能隙（為3.68 eV）的特性，為Ⅱ-Ⅵ族化合物半導體成員之一，早期應用在薄膜電激發光元件上。以其優異的發光特性，可發出可見光，故亦適合作為螢光材料。而螢光材料主要的用途是應用在照明光源、顯示器元件與光輻射偵測器等方面。本論文利用固態及化學共沉合成方法來製備奈米級硫化鋅螢光粉體並分別摻雜錳、銅、銪及鎂等螢光粉，同時利用X光繞射、穿透式電子顯微鏡、光激發光光譜、色度座標的量測結果來探討不同摻雜元素之奈米螢光粉體硫化物的特性，以期可用於白光LED。

在第一部份，我們利用固態法製備不同硫鋅比之硫化鋅並摻雜0.5mol%錳離子。藉由硫含量比率減少，使母體硫化鋅在450nm之藍光放射峰強度增強，搭配著摻雜錳離子所造成在588nm之橘黃光放射峰混成白光。本實驗用固態法，在硫鋅比為0.65，反應溫度分別為200℃與300℃條件下；以及在硫鋅比為0.75，反應溫度為100℃條件下，成功的備製一近似白光的硫化鋅摻雜0.5mol%的錳離子。

在第二部份，我們利用化學共沉法製備硫化鋅摻雜單一元素之螢光粉體(ZnS:Mn+2，ZnS:Cu+2，ZnS:Eu+3)，探討其發光特性。由實驗結果發現錳離子所造成放射峰位置約在橘光593nm處；銅離子摻雜少量時，其造成放射峰位置約在藍光470nm，當銅離子掺雜增加時，在綠光520nm放射峰強度隨之明顯。在另一方面，當銪離子摻雜於硫化鋅主體內其發光特性表現主要為紅光。未來可藉由共摻雜銅、銪離子，或銅、錳離子有機會得到白光螢光粉。

在第三部份，我們利用化學共沉法在室溫下所合成摻雜不同比例之鎂離子之硫化鋅摻雜2mol%錳離子放射光譜，放射峰位置約在597nm處為錳離子所造成的特性發光。其中當鎂含量為49%時為近似白光螢光粉體，其CIE值為(0.322，0.292)。

Abstract

Zinc sulfide (ZnS), as II-VI semiconductors with a wide band gap energy of 3.68eV, have received much attention due to their excellent luminescence properties and are commercially used in electroluminescence devices. They are candidate materials for phosphors that emit visible light. The major and important applications of phosphors are used as light sources, display devices, radiation detectors and so on. In this study, we prepare the nano-scaled ZnS based phosphors using solid state method and chemical precipitation method. Different dopants (Mn, Cu, Mg, Eu) have been introduced in the system. X-ray diffraction pattern, SEM, TEM, PL and CIE measurements have been used to investigate the characteristics of ZnS-based nano-phosphors for UV-white light LED applications.

Firstly , we synthesize and characterize the luminescence properties of ZnS：Mn nanophosphors by solid state method with different S/Zn ratio and under different temperature. When S/Zn ratio is 0.65 and under 300℃, a near white light phosphors are obtained and C.I.E. is (0.309,0.311).

Secondly, ZnS:Mn+2,ZnS:Cu+2 and ZnS:Eu+3 phosphors are prepared by chemical-precipitation method. From the emission spectra data, orange light with the emission peak at 593nm for ZnS:Mn+2 phosphors are detected, blue light at 470nm and green light at 520nm for ZnS:Cu+2 phosphors are detected, red light for ZnS:Eu+3 phosphors are also detected. It is possible to obtain white light phosphors by co-doping Cu+2,Eu+3 and Cu+2,Mn+2 in this system

Thirdly, ZnS co-doped Mg+2 and Mn+2 phosphors are synthesized by chemical precipitation method. From the emission spectra data, near white light is observed for Zn0.49Mg0.49S: Mn+2 (2mol%) and C.I.E is(0.322,0.292).

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