本文選題：納米晶　切入點(diǎn)：上轉(zhuǎn)換發(fā)光　出處：《吉林大學(xué)》2016年博士論文

【摘要】：有機(jī)聚合物光波導(dǎo)放大器具有制作工藝簡(jiǎn)單、制作成本低、折射率容易調(diào)整、機(jī)械性能好、容易與硅基平面集成等優(yōu)點(diǎn),在短距離光通訊系統(tǒng)和光子集成化方面展現(xiàn)出巨大的應(yīng)用潛力。目前,以稀土配合物為增益介質(zhì)制作的有機(jī)光波導(dǎo)放大器,在相應(yīng)的光波段已經(jīng)獲得了凈增益。但稀土配合物的光漂白性會(huì)使器件的穩(wěn)定性變差。稀土摻雜氟化物納米晶具有出色的光穩(wěn)定性、長(zhǎng)的熒光壽命、可選擇近紅外光泵浦等特點(diǎn),能夠克服上述材料的缺陷,成為理想的增益介質(zhì)。此外,我們可以通過(guò)改變摻雜稀土離子的種類制備出適用于不同波段的光波導(dǎo)放大器,例如:近紅外光有機(jī)光波導(dǎo)放大器(1.5mm波段)、可見(jiàn)光有機(jī)光波導(dǎo)放大器(0.6mm波段)。稀土摻雜氟化物納米晶的分散性、尺寸、發(fā)光強(qiáng)度都會(huì)影響有機(jī)光波導(dǎo)放大器的增益。納米晶的分散性越好、尺寸越小、發(fā)光強(qiáng)度越高,越有利于獲得高的增益。目前用于有機(jī)光波導(dǎo)放大器的稀土摻雜氟化物納米晶在分散性、尺寸、發(fā)光強(qiáng)度方面存在很多問(wèn)題。因此,合成分散性好、尺寸小、發(fā)光強(qiáng)的稀土摻雜氟化物納米晶是目前迫切需要解決的問(wèn)題。本文對(duì)用于有機(jī)光波導(dǎo)放大器的稀土摻雜氟化物納米晶進(jìn)行了系統(tǒng)的研究,取得了以下研究結(jié)果:1、為了制備用于近紅外有機(jī)光波導(dǎo)放大器的分散性好、尺寸小、發(fā)光強(qiáng)的稀土摻雜氟化物納米晶,我們提出了通過(guò)層層包覆有源殼層(殼層中包含Yb~(3+)離子)的方法提高小尺寸氟化物納米晶的發(fā)光強(qiáng)度。利用該方法合成了BaLuF_5:Yb~(3+),Er~(3+)@(X-shell,X=1~5)BaLuF_5:Yb~(3+)納米晶。在976 nm激光的激發(fā)下,測(cè)試了上述納米晶的上轉(zhuǎn)換和下轉(zhuǎn)換發(fā)光光譜。與Ba LuF_5:Yb~(3+),Er~(3+)核納米晶相比,BaLuF_5:Yb~(3+),Er~(3+)@(5-shell)Ba Lu F_5:Yb~(3+)核殼納米晶的上轉(zhuǎn)換和下轉(zhuǎn)換發(fā)光強(qiáng)度分別增強(qiáng)52倍和9.8倍;與殼層厚度相同的BaLuF_5:Yb,Er@BaLu F_5:Yb納米晶相比,BaLuF_5:Yb~(3+),Er~(3+)@(5-shell)Ba Lu F_5:Yb~(3+)納米晶的上轉(zhuǎn)換(545 nm波長(zhǎng)附近)和下轉(zhuǎn)換(1530 nm波長(zhǎng)附近)發(fā)光強(qiáng)度分別提高了1.3倍和1.1倍。發(fā)光強(qiáng)度增強(qiáng)的原因是:包覆有源殼層不僅能夠抑制納米晶的表面猝滅效應(yīng);有源殼層中的Yb~(3+)離子還能夠吸收泵浦光,并將能量傳遞給核中激活離子(Er~(3+)II離子),提高泵浦光的利用率;利用層層包覆的方法還能夠更好地抑制納米晶的表面猝滅效應(yīng)。我們將合成的分散性好、小尺寸、發(fā)光強(qiáng)的BaLu F_5:Yb~(3+),Er~(3+)@(5-shell)BaLu F_5:Yb~(3+)納米晶分散在SU-8聚合物中,制作了有機(jī)光波導(dǎo)放大器,在1530 nm波長(zhǎng)處獲得3.13 dB的相對(duì)增益。2、目前,還未見(jiàn)有關(guān)基于稀土摻雜氟化物納米晶的紅光有機(jī)光波導(dǎo)放大器的相關(guān)報(bào)道。我們制作出了基于上轉(zhuǎn)換納米晶的紅光有機(jī)光波導(dǎo)放大器,實(shí)現(xiàn)了對(duì)波長(zhǎng)為650 nm的光信號(hào)的放大。我們通過(guò)溶劑熱法合成了純紅色上轉(zhuǎn)換發(fā)光的KMnF_3:Yb~(3+),Er~(3+)納米晶。在976 nm激光泵浦下,KMnF_3:Yb~(3+),Er~(3+)納米晶能夠發(fā)射出單一的紅色上轉(zhuǎn)換發(fā)光(來(lái)自Er~(3+)離子輻射躍遷:4F9/2→4I15/2),這主要是由于Er~(3+)離子和Mn2+離子之間的能量傳遞:2H11/2,4S3/2+6A1→4I15/2+4T1,2H9/2+6A1→4I13/2+4T1,4I15/2+4T1→4F9/2+6A1所致。接下來(lái),在KMnF_3:Yb~(3+),Er~(3+)納米晶表面包覆一層有源殼層合成了具有純紅色上轉(zhuǎn)換發(fā)光的KMnF_3:Yb~(3+),Er~(3+)@KMnF_3:Yb~(3+)核殼納米晶,并將其分散于聚甲基丙烯酸甲酯(PMMA)聚合物中制作了有機(jī)光波導(dǎo)放大器,首次實(shí)現(xiàn)了對(duì)波長(zhǎng)為650 nm光信號(hào)的放大,獲得了3.5 dB的相對(duì)增益。3、為了制作寬帶近紅外有機(jī)光波導(dǎo)放大器,稀土摻雜氟化物納米晶需要具有好的分散性、高的發(fā)光強(qiáng)度、寬帶的近紅外發(fā)光的性質(zhì)。我們通過(guò)溶劑熱法合成了分散性好并具有寬帶近紅外發(fā)光的KMnF_3:Yb~(3+),Er~(3+)納米晶。在976 nm激光的泵浦下,KMnF_3:Yb~(3+),Er~(3+)納米晶在1.5mm波長(zhǎng)附近有兩個(gè)發(fā)光峰,其下轉(zhuǎn)換發(fā)光光譜的半高全寬(FWHM)比NaYF4:Yb~(3+),Er~(3+)納米晶的寬14 nm。我們通過(guò)包覆有源殼層的方法進(jìn)一步提高了KMnF_3:Yb~(3+),Er~(3+)納米晶在1.5mm波長(zhǎng)附近的下轉(zhuǎn)換發(fā)光,合成了分散性好、發(fā)光強(qiáng)、具有寬帶下轉(zhuǎn)換發(fā)光的KMnF_3:Yb~(3+),Er~(3+)@KMnF_3:Yb~(3+)納米晶,并將其分散在PMMA聚合物中制作了有機(jī)光波導(dǎo)放大器,在1534 nm波長(zhǎng)處獲得了0.6 dB的相對(duì)增益。
[Abstract]:Organic polymer optical waveguide amplifier has the advantages of simple preparation process, low production cost, easy to adjust the refractive index, good mechanical properties, has the advantages of easy and silicon planar integration, showing great potential for application in short distance optical communication and photonic integration. At present, the complexes of rare earth organic waveguide amplifier gain medium production the light in the corresponding band has received a net gain. But the rare earth complexes of light bleaching will make the device stability worse. Rare earth doped fluoride nanocrystals with excellent light stability, long fluorescence lifetime, can choose the near-infrared pump characteristics, can overcome the defects of the material, become the ideal gain medium. In addition, we can change the type of doped rare earth ions were prepared for optical waveguide amplifiers, different bands for example: near infrared organic waveguide amplifier (1.5m M band), visible light organic optical waveguide amplifiers (0.6mm band). The dispersion of rare earth doped fluoride nanocrystal size, the luminous intensity will affect the organic waveguide amplifier. The gain dispersion of nano crystal is smaller, the luminous intensity is high, the more conducive to obtain high gain. For now rare earth doped fluoride nanocrystals Organic Waveguide Amplifier in the dispersion, size, there are many problems in the luminescence intensity. Therefore, the synthesis of good dispersion, small size, rare earth doped fluoride nanocrystals emitting strong is an urgent need to solve the problem. This paper presents a systematic research on rare earth doped fluoride nanocrystals for organic light waveguide amplifier, and obtains the following results: 1, in order to prepare for the near infrared organic waveguide amplifier has good dispersion, small size, strong luminescence of rare earth doped fluoride nanocrystals, we 鎻愬嚭浜?jiǎn)椋?

本文編號(hào)：1701128