【摘要】：人們發(fā)現(xiàn)稀土上轉(zhuǎn)換發(fā)光材料能夠?qū)崿F(xiàn)激發(fā)光能量的上轉(zhuǎn)換,并在溫度測定、紅外輻射探測以及三維立體顯示等領(lǐng)域有著巨大的應(yīng)用潛力。選擇合適的上轉(zhuǎn)換基質(zhì)材料,有利于稀土離子上轉(zhuǎn)換發(fā)光效率的提高,所以尋找合適的上轉(zhuǎn)換基質(zhì)材料成為國內(nèi)外研究的熱點。而鐵酸鎵陶瓷(GaFeO_3)具有良好的物理化學(xué)穩(wěn)定性,聲子能量較低,適合作為稀土離子的基質(zhì)材料。因此,本課題選擇Er~(3+)和Yb~(3+)共摻的鐵酸鎵陶瓷(GaFeO_3)作為研究對象,研究其上轉(zhuǎn)換發(fā)光性質(zhì)。采用傳統(tǒng)的固相燒結(jié)法制備一系列不同濃度Er~(3+)和Yb~(3+)摻雜的鐵酸鎵陶瓷,Er~(3+)的摻雜濃度依次為1%,2%,3%,4%和5%,而Yb~(3+)離子摻雜濃度均為5%。通過對制備出的樣品進行XRD表征,拉曼光譜分析以及表面形貌表征等測試,檢測所制備的樣品是否合格。在室溫條件下,采用970 nm的激光器對一系列不同濃度的鉺鐿雙摻的鐵酸鎵陶瓷進行泵浦。通過分析其上轉(zhuǎn)換發(fā)光光譜,發(fā)現(xiàn)猝滅濃度為4%,認(rèn)為這是由于Er~(3+)離子濃度過高導(dǎo)致Er~(3+)離子之間發(fā)生了交叉馳豫過程,抑制了上轉(zhuǎn)換熒光發(fā)射過程。還進行了對鉺鐿雙摻的鐵酸鎵陶瓷進行上轉(zhuǎn)換熒光強度與泵浦光能量關(guān)系的探究,通過對熒光強度與泵浦能量進行雙對數(shù)擬合,我們發(fā)現(xiàn)擬合直線的斜率并不嚴(yán)格接近于上轉(zhuǎn)換過程中吸收的光子數(shù)。通過外加不同大小的電場,研究鉺鐿雙摻的鐵酸鎵陶瓷的上轉(zhuǎn)換熒光強度與外加電場的關(guān)系,發(fā)現(xiàn)隨著外加電場的不斷增大,各個熒光峰值會逐漸減弱。還通過改變鉺鐿雙摻的鐵酸鎵陶瓷樣品的環(huán)境溫度來研究上轉(zhuǎn)換熒光發(fā)射強度對溫度的響應(yīng)特性。本實驗首次得出了鉺鐿雙摻的鐵酸鎵陶瓷的溫度靈敏度曲線,為鐵酸鎵陶瓷應(yīng)用為復(fù)雜變溫環(huán)境下的上轉(zhuǎn)換發(fā)光材料提供了實驗依據(jù)。
[Abstract]:It has been found that rare earth up-conversion luminescent materials can realize the up-conversion of excited light energy and have great potential in the fields of temperature measurement infrared radiation detection and three-dimensional stereoscopic display. The selection of appropriate up-conversion matrix is beneficial to the improvement of luminescence efficiency of rare-earth ion upconversion, so finding suitable up-conversion substrate has become a hot topic at home and abroad. Gallium ferrate ceramics (GaFeO_3) have good physical and chemical stability and low phonon energy. Therefore, Er~ (3) and Yb~ (3) co-doped gallium ferrite ceramics (GaFeO_3) were selected as the research object in this paper, and their up-conversion luminescence properties were studied. A series of gallium ferrite ceramics with different concentrations of Er~ (3) and Yb~ (3) were prepared by traditional solid-state sintering method. The doping concentrations of Er~ (3) were 1% and 5% respectively. The doping concentration of Yb~ (3) ions is 5%. The samples were characterized by XRD, Raman spectroscopy and surface morphology. A series of erbium and ytterbium doped gallium ferrite ceramics with different concentrations were pumped by a 970 nm laser at room temperature. It is found that the quenching concentration is 4, which is attributed to the cross relaxation process between Er~ (3) ions due to the high concentration of Er~ (3) ions, which inhibits the up-conversion fluorescence emission process. The relationship between the up-conversion fluorescence intensity and the pump energy of erbium and ytterbium-doped gallium ferrite ceramics was also investigated. The fluorescence intensity and pump energy were fitted logarithmically. We find that the slope of the fitting line is not close to the number of photons absorbed in the upconversion process. The relationship between the up-conversion fluorescence intensity and the applied electric field of the erbium-ytterbium-doped gallium ferrite ceramics was studied by applying different electric fields. It was found that with the increasing of the applied electric field, each fluorescence peak value would weaken gradually. The response of up-conversion fluorescence emission intensity to temperature was also studied by changing the ambient temperature of Erbium-ytterbium-doped gallium ferrate ceramics. For the first time, the temperature sensitivity curves of erbium and ytterbium doped gallium ferrite ceramics are obtained, which provides experimental basis for the application of gallium ferrite ceramics to upconversion luminescent materials under complex temperature varying conditions.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ174.13

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