摻雜銪之鹼土矽酸鹽螢光粉之合成與發光特性研究

Synthesis and Luminescent Properties of Europium-activated Li2MSiO4 (M=Ca, Sr) phosphors

侯政宏(Cheng-Hung Hou)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

摘要

本研究旨在探討新型鹼土矽酸鹽系螢光粉的製備與發光特性。利用傳統高溫固態反應法製備以稀土金屬銪活化之Li2MSiO4(M=Ca, Sr)螢光粉體，觀察煆燒溫度、持溫時間、反應氣氛、銪離子濃度等實驗參數對其發光性質的影響。
放射光譜量測結果顯示，Li2MSiO4:Eu3+(M=Ca, Sr)螢光粉的放射峰來自5D0→7FJ(J=1,2,3,4)躍遷，且放射光譜形狀不受主體晶格改變的影響，皆呈現橘紅光放射；Li2MSiO4:Eu2+(M=Ca, Sr)螢光粉的放射光譜以6P7/2→8S7/2的躍遷為主，但峰值位置受到主體晶格的共價性與晶體場分裂效應影響，分別放出480nm的藍綠光或570nm的黃光。
根據激發光譜分析，Li2MSiO4:Eu3+(M=Ca, Sr)及Li2CaSiO4:Eu2+螢光粉的激發波段主要位於紫外光區域；Li2SrSiO4:Eu2+螢光粉的激發波段主要位於可見光區域。兩者分別在以紫外光晶片或藍光晶片激發的白光LED領域上具有應用潛力。

關鍵字

螢光粉 ； Li2SrSiO4 ； Li2CaSiO4 ； Eu3+ ； Eu2+ ； 固態反應法

並列摘要

This study is focused on the synthesis and luminescent properties of novel alkaline silicate phosphors. Conventional solid state reaction method is adopted to synthesize europium-activated Li2MSiO4 (M=Ca, Sr) phosphors. And the effect of different firing temperature, soaking time, europium concentration and atmosphere on the luminescent properties is observed.
The emission peaks of Li2MSiO4:Eu3+(M=Ca, Sr) phosphors are originated from 5D0→7FJ(J=1,2,3,4) transitions, which show a orange-red color and are also independent of host lattice surroundings. And Li2MSiO4:Eu2+(M=Ca, Sr) phosphors show a 6P7/2→8S7/2 transition with bluish-green 480nm or yellowish 570nm emission, which depends on the covalence and crystal field splitting effects of the host lattice.
Based on excitation spectra analysis, the main excitation peaks of Li2MSiO4:Eu3+ (M=Ca, Sr) and Li2CaSiO4:Eu2+ phosphors are located at ultraviolet region of the spectrum and at visible region for the Li2SrSiO4:Eu2+ phosphor, which possess potentials on UV-chip or blue-chip excited WLED applications, respectively.

並列關鍵字

Phosphor ； Li2SrSiO4 ； Li2CaSiO4 ； Eu3+ ； Eu2+ ； Solid-state Reaction

參考文獻

[24] 林蘇逸，高演色性白光發光二極體之研究，碩士論文，國立臺灣大學電機資訊學院光電工程學研究所，台北，民96.

[25] 劉宇桓，發光二極體激發之氧氮化合物螢光粉合成與其特性研究，碩士論文，國立臺灣大學化學研究所，台北，民95.

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