為了提升目前常用之白光LED元件 (blue LED+YAG: Ce3+)之演色性，利用近紫外LED驅動多色螢光粉為一可行的方式，因此本研究利用固態反應法合成適用於近紫外激發之矽酸鹽類藍綠色螢光粉與磷酸鹽類黃、橘紅色螢光粉。本研究分為三個部份，第一部分，本研究發現藉由摻雜與Eu2+離子半徑較為接近的Sr2+離子取代BaZrSi3O9:Eu2+的Ba2+離子可以提升Eu2+摻雜於主體的固溶度，進而增加其發光強度。此外，為了提升BaZrSi3O9:Eu2+螢光粉的熱穩定性，藉由摻雜Hf4+離子，部分取代Zr4+離子，增加螢光粉的熱穩定性，然而，雖然摻雜Hf4+離子可以增加此螢光粉的熱穩定性，但同時也伴隨著雜相生成而降低發光效率，因此加入助熔劑提升螢光粉主體的相純度，於加入助熔劑6 wt%時，可達到兼具發光強度與熱穩定性提升之目的，可將Ba0.94Zr0.9Hf0.1Si3O9:0.06Eu2+的發光強度提升12.4%並將活化能從0.374 提升到 0.397電子伏特。
第二部分為合成黃色、橘紅色以Ca6BaP4O17為主體的螢光粉。於橘紅色磷酸鹽螢光粉部分，藉由摻雜Sm3+於Ca6BaP4O17主體，可得到三個波段567, 602, and 650 nm為主的窄譜光譜，並藉由共摻雜一價鹼金屬(Na+、Li+)做電荷補償，除了可以提升其發光強度，同時也增加其熱穩定性，於操作溫度200 oC時，能可保有93%之發光強度；此外本研究也發先於合成Ca6BaP4O17:Sm3+螢光粉時，藉由通入Ar惰性氣體，可以增加Sm3+離子的固溶度讓濃度粹滅點從0.12 mol降低至0.06 mol，進一步提升發光強度。於黃色磷酸鹽螢光粉部分，則選擇摻雜Eu2+於Ca6BaP4O17主體，藉由去離子水修飾原始物料使其混合更為均勻，讓原子間更易轉移、反應溫度降低，進而提升螢光粉之相純度，進而提升發光強度11.9%。
第三部分為將螢光粉結合矽膠製作白光LED元件，主要分為兩種元件，第一種為螢光層分層結構，將藍綠色矽酸鹽類螢光粉結合商用紅色螢光粉，利用分層螢光粉層結構製作高演色性白光LED，最高演色性可達93.8、色溫可由2908K調變至4902K，第二種為新型圓臺式封裝，藉由圓臺式封裝，可讓白光LED的出光均勻性更為均勻，藉由較大體積之螢光粉層，也可降低螢光粉的使用量。利用配光曲線量測，對於各角度所量測的色溫做標準差計算，可藉此判斷LED元件的色溫均勻性。而相較於傳統式點膠封裝方式，圓臺式封裝的各角度色溫標準差可從1246K 降低至51K。

Commercial white light-emitting diodes (WLEDs) were fabricated by blue GaN (450–470 nm) chips coating with commercial yellow garnet phosphors (YAG:Ce3+). This method is well known that this combination lacks of red emission spectrum component leading to the white light with poor color rendering index (CRI) and high correlated color temperature (CCT). To solve the CRI and CCT problem of WLEDs (blue LED + YAG: Ce3+), developing multi-chromatic phosphors combing with near-ultraviolet (near-UV) InGaN LED chip (370 – 410 nm) is an alternative method. This thesis is composed of three parts. Part (1), doping Sr2+ into BaZrSi3O9:Eu2+ blue-green phosphor can enhance the emission intensity due to the solid solubility improvement. Besides, in order to improve the thermal stability of BaZrSi3O9:Eu2+ blue-green phosphors, Hf4+ dopants were introduced to substitute Zr4+ site to enhance the activation energy of BaZrSi3O9:Eu2+ phosphors. However, there were impurity phase forming due to the Hf4+ doping. Hence, the NH4Cl flux additives were added for better phase formation. The emission intensity and thermal stability could simultaneously be enhanced when the flux concentration being 6 wt%. The integrated emission intensity of Ba0.94Zr0.9Hf0.1Si3O9:0.06Eu2+ was enhanced 12.4% with NH4Cl flux additive. Furthermore, the activation energy was improved from 0.374 to 0.397 eV.
Part (2), orange-reddish and yellow Ca6BaP4O17 based phosphate phosphors were synthesized. The Ca6BaP4O17:Sm3+ orange-reddish phosphors can be excited by 405 nm near-UV LED chip, and their emission spectrum consists of three emission peaks, at 567, 602, and 650 nm, respectively. The emission intensities and thermal stabilities could be enhanced by codoping alkali metal ions A+ (A = Na and Li) as charge compensators. The integrated emission intensities of Na-codoped and Li-codoped samples under the temperature of 200 °C were still 91% and 93% of that measured at room temperature. In addition, by introducing Ar atmosphere during the synthesizing process, the emission intensity of Ca6BaP4O17:Sm3+ phosphor was improved 2.27-fold. Besides, the concentration quenching point of Ca6BaP4O17:Sm3+ was decreased form 12 mol% to 6 mol%. For Ca6BaP4O17:Eu2+ yellow phosphors, deionized water was used to modify the raw materials for getting a purer phase of phosphors. Hence, the integrated emission intensity was also improved 11.9% because the reaction temperature getting lower leading to the improved yield.
In Part (3), white light-emitting diodes are fabricated using 405 UV LED chips and proposed phosphors with two different structures. (I) Phosphor-converted white light-emitting diodes (pc-WLEDs) were fabricated using two separated phosphor layers (B&G up/R down) that combine three color phosphors (blue, green, and red) with near-ultraviolet light-emitting diode chips. The pc-WLEDs have a high color rendering index (93.8) and tunable color temperature (2908–4902K). (II) The frustum-shaped phosphor gels were coated on LED chip to improve the emitting light intensity and uniformity compared to pc-WLEDs fabricated by using conventional packaging method. The results indicated that pc-WLEDs with frustum-shaped packaging method show better uniformity and emitting light intensity than those with conventional packaging method. The standard deviations of CCT at various view angles were reduced form 1246K to 51K for the samples using conventional and frustum-shaped packaging methods, respectively.

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