熱蒸鍍法在不同溫度生長2,6-雙[3-(9H-咔唑-9-基)苯基]吡啶薄膜之物材料特性研究

Investigation of material properties of 2 ,6-bis(3- (9H-carbazol-9-yl)phenyl)pyridine thin films grown at different temperatures by thermal evaporation

王之言(Zhi-Yan Wang)

指導教授 ： 何青原

中原大學/工學院/機械工程研究所/碩士(2018年)

https://doi.org/10.6840/cycu201800114

摘要

在此研究中，討論了物理氣相沉積工藝中，在不同沉積溫度（Tsub）下生長的2,6-雙[3-（咔唑-9-基）苯基]（26DczPPy）薄膜的結構和光學性質。在結構分析中，使用熱重分析（TGA）和差示掃描量熱法（DSC）測量26DczPPy粉末，確認玻璃化轉變溫度（Tg）為107℃，冷結晶溫度（Tc）為187℃，熔點（Tm）為230℃，並選擇115℃至170℃作為沈積溫度。然後，使用SEM的側視圖和俯視圖，我們探討了表面形貌和尺寸的變化，由於這些薄膜的生長行為遵循活化能的表面 - 吸附過程，因此由Arrhenius估計Ea = 9.5eV。最後，XRD表明，Tsub為115〜160℃的26DczPPy薄膜是非晶態的，當Tsub = 170℃時，新相開始聚集。在光學質量測量中，使用紫外線/可見光分光光譜和光激螢光光譜（PL）進行分析。工作表明，Tsub 由 115℃上升至160℃中，由於分子的重排和π-π鍵的增強，導致PL逐漸增加，光學帶隙（Eg）減小。然而，在170℃下PL的猝滅是由於存在部分結晶區域，促進了激子向非輻射輻射中心的擴散。這項研究表明，Tsub對26DczPPy薄膜的結構和光學性能有很強的影響。

關鍵字

吸附 ； 生長模式 ； 表面結構 ； 真空環境中生長 ； 物理氣相沉積工藝 ； 有機化合物 ； 26DczPPy

並列摘要

In this study, the structure and optical properties of the 2,6-bis[3-(carbazol-9-yl)phenyl] (26DczPPy) films prepared at different deposition temperatures were investigated. In the structural analysis, 26DczPPy powder was measured using Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) to confirm the glass transition temperature (Tg) is 107° C, the cold crystallization temperature (Tc) is 187° C and the melting point (Tm) is 230° C , and 115 ° C to 170 ° C was used as the deposition temperature. Then, using the side view and the top view of the SEM, we discuss the change of the surface morphology and size, and confirm that the growth behavior of these modules follows an activated surface-adsorption process and Ea =0.44±0.07 eV was estimated by Arrhenius plot. Finally, XRD indicates that the 26DczPPy films which Tsub is 115 to 160 ° C are amorphous, and when Tsub = 170 ° C, the new phase starts to aggregate. In the optical quality measurement, the use of optical UV-vis-NIR and luminescence spectroscopy (PL) were used for analysis. The work showed that the photoluminescence (PL) gradually increases and the optical band gap (Eg) decreased with Tsub =115-160 due to the rearrangement of the molecules and the enhancement of the π-π bonds. However, PL quenching at 170 C was due to the presence of a portion of the crystalline region, facilitating the diffusion of excitons to the center of nonradiative radiation. This work demonstrates that Tsub has a strong effect on the structural and optical properties of the 26DczPPy films.

並列關鍵字

Adsorption ； Growth models ； Surface structure ； Growth from vapor ； Physical vapor deposition processes ； Organic compounds ； 26DczPPy

參考文獻

[1] C. W. Tang, S. A. VanSlyke, “Organic electroluminescent diodes,” Appl. Phys. Lett. , Vol. 51, pp. 913–915, 1983

[2] K. T. Kamtekar, A. P. Monkman, M. R. Bryce, “Recent Advances in White Organic Light-Emitting Materials and Devices (WOLEDs),” Adv. Mater. , Vol. 22 , pp. 572, 2009.

[3] L. X. Xiao, Z. J. Chen, B. Qu, J. X. Luo, S. Kong, Q. H. Gong, J. Kido, “Recent Progresses on Materials for Electrophosphorescent Organic Light-Emitting Devices,” Adv. Mater. , vol. 23, pp. 926 , 2011.

[4] M. C. Gather, A. Kohnen, K. Meerholz, “White Organic Light-Emitting Diodes,” Adv. Mater. ,col. 23 ,pp. 233, 2011.

[5] M. A. Baldo, D. F. O’Brien, Y. You, A. Shoustikov, S. Sibley, M. E. Thompson, S. R. Forrest, “Highly efficient phosphorescent emission from organic electroluminescent devices, Nature,” vol. 395, pp. 151, 1998.