LED圖案化螢光膜片之量測與分析

Abstract

白光LED將成為下世代照明的主流，目前市場以藍光LED晶片搭配黃色螢光粉的方式製作白光LED，而美國能源局(DOE)已明訂2015年起LED燈具空間角度色偏＜±100 K，色差＜2色容差(standard deviation of color matching, SDCM)的標準，然而目前傳統螢光粉點膠法因為空間色偏大、批量色差大、螢光粉沉降等問題未能符合要求。目前市場上興起許多取代傳統點膠法之螢光膜片等新製程，惟對於螢光貼片生產後之光學量測與分析，尚未建立系統性的分析與量測方法，本論文發展了一套大面積螢光貼片量測系統，藉由PM9成像色度計配合自製藍光背光源，並同時與光譜儀量測法進行色溫校正。成功量測以模造法方式，製造出相同厚度且高均勻度之矩陣式圖案化螢光膜片，每一小片之色容差可以小於2，其藉由PM9成像色度計架設量測系統量測，且與光譜儀量測法加以驗證。接著，我們將所製作之圖案化螢光膜片黏貼至垂直式藍光晶片，完成白光LED封裝，藉由垂直式藍光晶片無側邊漏光及超均勻螢光膜片之特性，明顯降低空間角度色偏問題，最後嘗試以光學模擬驗證的方式探討黏層的光學特性，發現黏著膠層的尺寸變異，將主導封裝後的光學特性。

The white light emitting diode (LED) has become the most popular lighting for the next generation. The department of energy (DOE) of the United States has stipulated the standard of luminaire that the spatial angular color deviation (SACD) should be less than ±100K and the SDCM (standard deviation of color matching) needs to be smaller than 2 since 2015. However, the traditional phosphor dispensing method suffered the problems of huge SACD, large batch color shift, phosphor sedimentation and so on. Many processes of phosphor films have been mentioned to replace the traditional phosphor dispensing method so far, but not yet established systematic analysis and measurement methods after production. In this thesis, we developed a measurement system for the phosphor film by using Prometric 9 (PM9) and a homemade blue backlight, and verified and regulated by using the spectrometer measurement method. We manufactured the matrix type of patterned phosphor film with the same thickness and uniformity by molding process, and succeeded to measure the SDCM of phosphor film of each small piece to be less than 2. In addition, white LED we made by the small pieces of patterned phosphor film bond to the vertical blue chip, which reduced the problem of SACD due to no side light leak and uniformity of phosphor film. Finally, we attempted to explore the optical properties of bonding layer by simulation, and found that the bonding layer with size variation will dominate the optical properties of the encapsulation.