BaSi2O5: Eu2+, Dy3+鹼土矽酸鹽螢光粉之合成與發光特性研究

Study on the Preparation and Luminescent Properties of BaSi2O5: Eu2+, Dy3+ Phosphors

陳佳凰(Chia-Huang Chen)

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(2013年)

https://doi.org/10.6841/NTUT.2013.00473

摘要

本研究旨在探討鹼土矽酸鹽系螢光粉體的製備與餘輝特性。利用傳統高溫固態反應法製備共摻雜不同稀土元素之BaSi2O5: Eu2+, Dy3+螢光粉體。在製備BaSi2O5母體時，討論添加不同種類的助熔劑、助熔劑添加濃度的差異及不同合成溫度對BaSi2O5母體合成的影響。摻雜激活劑時，利用Eu(NO3)3?6H2O進行水溶液的摻雜方式，以及Dy2O3的摻雜，分別觀察共摻雜Eu2+及Dy3+的先後順序、在還原氣氛下的燒成溫度、摻雜Eu2+及Dy3+濃度比例等實驗參數對其餘輝性質的影響。
實驗結果顯示，助熔劑添加2 wt.% LiF並在大氣中燒成溫度為1250°C，可合成出BaSi2O5母體較純的相，並且具有良好的發光強度。放射光譜量測結果顯示，BaSi2O5: Eu3+, Dy3+螢光粉體，Eu3+為主要的發光中心，其放射峰來自5D0→7FJ（J= 0, 1, 2, 3, 4）的躍遷，呈現橘紅光放射；BaSi2O5: Eu2+, Dy3+螢光粉體，Eu2+為主要的發光中心，其放射峰來自5D0→7FJ（J= 0, 1, 2, 3, 4）的躍遷，呈現藍綠光放射。
BaSi2O5: Eu2+, Dy3+螢光粉體具有餘輝現象，其持續發光時間可達3600秒，甚至比市面上其他餘輝材料有更長的發光時間，具有好的商業應用潛力。

關鍵字

螢光粉 ； BaSi2O5 ； Eu3+ ； Eu2+ ； Dy3+ ； 固態反應法 ； 餘輝

並列摘要

This study is focused on the synthesis and afterglow characteristics of alkaline silicate phosphors. Conventional high-temperature solid state reaction method is adopted to synthesize co-doping earth element BaSi2O5: Eu2+, Dy3+ phosphors. To synthesize BaSi2O5 host, we discuss the effect of different flux, flux concentrations, and firing temperature. In activator doping process Eu(NO3)3?6H2O solution and Dy2O3 for doping, Eu2+, Dy3+ doping sequential, doping atmosphere and firing temperature, doping Eu2+ and Dy3+ concentration ratios on the afterglow properties is observed.
Experimental results show that adding 2 wt.% LiF flux in the atmosphere and the firing temperature is 1250°C, can be prepared with relatively pure precursor BaSi2O5, and has a good luminous intensity. Emission spectrum measurement results show, BaSi2O5: Eu3+, Dy3+ phosphors, Eu3+ as the main emission center, radiation peaks from 5D0→7FJ（J= 0, 1, 2, 3, 4） transition, showing orange light radiation; BaSi2O5: Eu2+, Dy3+ phosphors, Eu2+ as the main luminescence centers, and its emission peak from the
5D0→7FJ（J= 0, 1, 2, 3, 4）transition, blue-green emission.
BaSi2O5: Eu2+, Dy3+ phosphors with afterglow characteristics, and a presistent time about 3600 s, it has potential application in market.

並列關鍵字

Phosphor ； BaSi2O5 ； Eu3+ ； Eu2+ ； Dy3+ ； Solid-state reaction ； afterglow

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