本文選題：LED封裝 + 聚合物成型�。� 參考：《華中科技大學》2016年博士論文

【摘要】：LED光源光形是走向不同照明應(yīng)用需求的必要條件,空間顏色均勻性是衡量LED照明品質(zhì)的重要性能參數(shù)。決定LED光形和空間顏色均勻性的關(guān)鍵性因素為LED封裝制造過程中透鏡成型和熒光粉涂覆工藝。然而目前業(yè)界在這些關(guān)鍵工藝方面存在著不足,LED光形控制和空間顏色均勻性還需要進一步改進。本文基于熒光粉涂覆和透鏡制造過程涉及的共性問題——聚合物流體到固體成型過程的形貌控制,研究電場調(diào)控聚合物成型技術(shù),利用電場調(diào)控作用實現(xiàn)新型的熒光粉涂覆工藝和透鏡制造技術(shù)。主要研究內(nèi)容和創(chuàng)新點包括：開展電場調(diào)控聚合物成型過程的實驗研究,并分析了電場強度和聚合物材料物性參數(shù)對其形貌變化的影響規(guī)律。結(jié)果表明,電場作用下,電壓大小、電極間距、聚合物初始高度和溫度載荷是聚合物形貌調(diào)控的關(guān)鍵影響因素；對于不同聚合物材料,其介電常數(shù)與表面張力相關(guān)的系數(shù)大小決定聚合物形貌變化規(guī)律。建立了基于靜電-水平集兩相流的多物理場耦合分析模型,理論分析了不同工藝參數(shù)對形貌調(diào)控的影響規(guī)律。結(jié)果表明,在電場作用下,較大的電壓、聚合物初始高度和介電常數(shù)以及較小的電極間距和聚合物表面張力均能得到較大的聚合物流動變形；而聚合物粘度對穩(wěn)態(tài)形貌并無影響。通過數(shù)值模擬獲取了實現(xiàn)不同聚合物形貌的工藝條件：平板-平板電極實現(xiàn)錐形聚合物形貌,圓環(huán)-平板電極實現(xiàn)扁平聚合物形貌,非對稱圓柱-平板電極實現(xiàn)非對稱聚合物形貌,圓錐-平板電極實現(xiàn)火山口聚合物形貌。提出了電場調(diào)控成型的熒光粉涂覆工藝,獲得了錐形熒光粉層,以調(diào)節(jié)封裝LED的空間色溫分布。通過光學模擬研究了錐形熒光粉層形貌對封裝LED空間顏色均勻性的影響,模擬結(jié)果表明：與球帽形熒光粉層相比,錐形熒光粉層封裝LED的空間顏色均勻性最大提高26.0%,熒光粉材料最多節(jié)約7.66%。開展了電場調(diào)控成型的熒光粉涂覆實驗,實現(xiàn)了錐形熒光粉層。測試結(jié)果表明,錐形熒光粉層封裝LED的空間相關(guān)色溫差值從大于1000K減少為180K。提出了電場作用形貌可調(diào)控透鏡制造技術(shù)。在不同電場作用下,分別獲得了錐形、扁平和非對稱形貌透鏡,并且每種透鏡的高度通過電場強度的調(diào)節(jié)實現(xiàn)了連續(xù)精確控制。測試結(jié)果表明,錐形、扁平和非對稱形貌透鏡封裝LED分別實現(xiàn)了匯聚、發(fā)散和非對稱光強分布,最大光強分別提高了35%、31%和39%。對于扁平和非對稱透鏡,最大光強發(fā)生視角分別由0°變?yōu)椤?6°和-48°。提出了電場作用對準的液滴蒸發(fā)法透鏡制造技術(shù),得到了火山口形貌透鏡,實現(xiàn)了LED封裝模塊的均勻照明�；陔妶鲎饔脤崿F(xiàn)了液滴位置對準,通過液滴蒸發(fā)法得到了火山口形貌,并分析了不同液滴體積對火山口形貌的影響以及對LED封裝模塊出光光強分布的調(diào)控效果。光學測試表明,制造的火山口形貌透鏡實現(xiàn)了可應(yīng)用于均勻照明的蝙蝠形光強分布,最大光強提高了17%,最大光強發(fā)生視角由00變?yōu)?540,光強比值從1增大為2.55。
[Abstract]:The optical shape of LED light source is a necessary condition for different lighting application requirements. Space color uniformity is an important performance parameter for measuring the quality of LED lighting. The key factor determining the LED light and space color uniformity is the lens molding and phosphor coating process in the LED packaging manufacturing process. However, the industry is currently in these key technologies. In this paper, LED optical control and space color uniformity need to be further improved. Based on the common problems involved in the coating of phosphor powder and lens manufacturing process, the morphology control of polymer fluid to solid molding process, the study of electric field controlled polymer molding technology, and the application of electric field regulation to the realization of new fluorescent powder coating. The main research contents and innovation points include: carrying out experimental research on the process of polymer forming by electric field regulation, and analyzing the influence of electric field intensity and material properties of polymer on the change of morphology. The results show that the voltage size, the distance between electrodes, the initial height and temperature of the polymer under the action of the electric field. Load is a key factor in the regulation of polymer morphology. For different polymer materials, the coefficient of dielectric constant related to surface tension determines the change law of polymer morphology. A multi physical field coupling analysis model based on electrostatic horizontal set two-phase flow is established. The influence of different process parameters on morphology control is analyzed. The results show that, under the action of the electric field, the larger voltage, the initial height and the dielectric constant of the polymer, the smaller electrode spacing and the surface tension of the polymer all get the larger flow deformation of the polymer, and the viscosity of the polymer has no effect on the steady state. A flat plate electrode was used to realize the morphology of the conical polymer, the circular ring plate electrode was used to realize the flat polymer morphology, the Asymmetric Cylinder plate electrode was used to realize the asymmetric polymer morphology, and the conical plate electrode was used to realize the morphologies of the crater polymer. The fluorescent powder coating process was proposed by the electric field control and the conical phosphor layer was obtained. The spatial color temperature distribution of LED is encapsulated. The effect of the conical phosphor layer morphology on the space color uniformity of the encapsulated LED is studied by optical simulation. The simulation results show that the space color uniformity of the conical phosphor layer packaging LED is increased by 26% compared with the ball cap phosphor layer, and the phosphor material saves most of the 7.66%. to carry out the electric field adjustment. The conical phosphor layer is realized by the coated fluorescent powder coating experiment. The test results show that the spatial correlation color temperature difference of the conical phosphor layer package LED is reduced from more than 1000K to 180K., and the electric field morphology can be used to regulate the lens manufacturing technology. The height of each lens is controlled continuously and accurately by the adjustment of the electric field intensity. The test results show that the conical, flat and asymmetric morphology lens package LED achieves convergence, divergence and asymmetric light intensity distribution, and the maximum light intensity is increased by 35%, 31% and 39%. for flat and asymmetric lenses, and the maximum light intensity angle of view is respectively. From 0 degrees to 46 degrees and -48 degrees, a lensing technology of droplet evaporation method is proposed. The morphology lens of the crater is obtained, and the uniform illumination of the LED package module is realized. The position alignment of the droplet is realized based on the effect of the electric field. The morphology of the crater is obtained by the droplet evaporation method, and the different droplet volume on the volcanic mouth shape is analyzed. The effect of the appearance and the intensity distribution of the light and light intensity of the LED package module. The optical test shows that the produced crater morphology lens can be applied to the uniform illumination distribution of the bat shaped light intensity, the maximum light intensity is increased by 17%, the maximum light intensity angle of light is changed from 00 to +540, and the light intensity ratio is increased from 1 to 2.55.
【學位授予單位】：華中科技大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN312.8

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