為了製作出高演色性(Color rendering index, CRI)與高均勻度之白色發光二極體(Light-emitting diode, LED)，於本研究中使用近紫外(Near-ultra violet, NUV)之LED(NUV-LED)與橘紅色之Sr3(1-x)Al2O5Cl2：3xEu2+和本實驗室合成之藍綠色Ba1-xZrSi3O9：xEu2+螢光粉合成出白光，其中Sr3(1-x)Al2O5Cl2：3xEu2+透過以離子半徑較小之Ca2+取代Sr2+離子的方式改變成Sr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+，使其放射光譜紅移，在y = 0.12時，於397 nm激發之下，放射光譜之波峰由原本之620 nm移動至638 nm，使其能夠進一步補償於螢光粉封裝白光 LED (Phosphor converted white light-emitting diode, pc-WLED)中容易缺乏的紅光波段，提高其CRI值。
pc-WLED之封裝包含了許多控制參數，故本實驗先以商用螢光粉進行封裝，分析各項參數對出光特性之影響，發現於傳統封裝中，固定特定曲率與相同色度座標之條件下，低螢光粉濃度封裝相比於高螢光粉濃度封裝之pc-WLED，光強度略有提升(1.21 %)，且各角度之CCT標準差值較低(低濃度封裝：15.04%，高濃度封裝：26.64%)，表示其發光色度較為均勻，並於前述之結論下開發出新型的圓臺式封裝方式，進一步提高各項光特性，與低濃度傳統式封裝之pc-WLED相比，其光強度提升了8.33%，各角度光強度之標準差由傳統封裝之35.359降低至19.4947 %，CCT之標準差更是降低至4.308%。
Sr3(1-x)Al2O5Cl2：3xEu2+與Sr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+各別使用於LED封裝時，CRI分別能夠到達73.785與76.23，配合Ba1-xZrSi3O9：xEu2+藍綠色螢光粉後則分別能達到CRI 90.012與92.297，且結合圓臺式封裝後，其光強度與CRI之各角度標準差只有18.81 %和1.1445 %，代表其色度均勻性極佳，相較於傳統式封裝，圓臺式封裝更適合應用於照明燈源。

In order to fabricate white light-emitting diodes (WLEDs) with high color rendering index (CRI) and high chroma uniformity, orange phosphor Sr3(1-x)Al2O5Cl2：3xEu2+ and blue-green phosphor Ba1-xZrSi3O9：xEu2+ were chosen to integrate with near-ultra violet(NUV)-LED to emit white light. To compensate the lack of long wavelength in common WLEDs, Ca2+ ions with smaller ionic radius (99 pm) were added in Sr3(1-x)Al2O5Cl2：3xEu2+ to replace the Sr2+ ions that have larger ionic radius (113 pm) to redshift the emission spectrum. When the y value in the Sr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+ increases from 0 to 0.12, the peak of emission under an excitaion of 397 nm shifts from 620 nm to 638 nm, which makes its spectrum close to red light.
There are lots of control parameters in the conventional packaging of phosphor converted-WLED (pc-WLED). To get better optical properties, we investigated the influence of these parameters, and found that the pc-WLEDs with lower phosphor concentration (Y14.2%/R1%) would have slight increase (1.21 %) in intensity than pc-WLEDs with higher phosphor concentration (Y20.42%/R1.4%). Furthermore, the standard deviation (SD) in percentage of CCT of 19 different view angle (0o to 180o, 10o/step) of pcWLEDs with lower phosphor concentration (15.04 %) is lower than those with higher phosphor concentration (26.64 %), which means a better chromatic uniformity.
Based on the results above, a new packaging method has been developed, a frustum-shaped mass phosphor-gel was coated on LED chip with extremely low phosphor concentration of about one seventh of conventional packaging way. The light intensity of pc-WLEDs with frustum-shaped mass phosphor-gel is higher than those with conventional package (with an improvement of 8.33%). Also the SD (%) of light intensity of 19 different view angle (0o to 180o, 10o/step) of pcWLEDs with frustum-shaped phosphor-gel is much lower than those with conventional package, which were 19.4947 and 35.359 %, respectively, and the SD (%) of CCT of pcWLEDs with frustum-shaped phosphor-gel even reduced to 4.308%.
Phosphor-gels of Sr3(1-x)Al2O5Cl2：3xEu2+and Sr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+ were coated on LEDs individually, the CCT of which were 73.785 and 76.23, respectively. With the addition ofBa1-xZrSi3O9：xEu2+ phosphor, CCT of pc-WLEDs with Sr3(1-x)Al2O5Cl2：3xEu2+ and Sr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+could reach a value of 90.012 and 92.297 individually.
Combined with the frustum-shaped package, SD (%) of intensity and CCT of pc-WLED fabricated withSr3(1-x-y)Ca3yAl2O5Cl2：3xEu2+ and Ba1-xZrSi3O9：xEu2+phosphor were 18.81% and 1.1445%, which means an extremely good intensity and chromatic uniformity.

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