SrAl12O19: Mn4+ 적색 형광체의 플럭스와 Mn 농도에 따른 영향 및 발광특성
Photoluminescence properties of SrAl12O19 : Mn4+ red phosphor depending on Mn concentration and fluxes
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본 연구에서는 장파장 UV 영역하에서 비교적 우수한 발광강도를 가지는 적색 형광체를 얻기 위하여 고상법으 로 합성하여 발광특성을 관찰하였다. SrAl12O19: Mn 4+ 적색 형광체의 발광강도는 Mn 4+의 2 E→ 4 A2 천이 때문에 643, 656, 666, 671 nm에서 4개의 sharp한 peak이 600~700 nm의 영역에서 발생하였으며, 여기스펙트럼은 250~550 nm 넓은 영역에서 338, 398, 468 nm 3개의 peak이 발생하였다. 또한 SrAl12O19: Mn 4+에 0.67 mol% MgO를 함유한 SrAl12O19: Mn 4+의 상대적인 발광강도는 SrAl12O19: Mn 4+ 보다 약 30 % 정도 증가하였는데, 이러한 원인은 MgO가 첨가되어 Al2O3 부분에 대체되어진 것으로 사료된다. 또한, 발광강도를 향상시키기 위하여 0.67 mol% MgO를 함유한 SrAl12O19: Mn 4+ 시료에 CaF2를 첨가하였 다. 0.67 mol% CaF2와 0.67 mol% MgO를 함유한 SrAl12O19: Mn 4+의 656 nm에서의 상대적인 발광강도는 융제를 첨가하지 않 은 SrAl12O19: Mn 4+보다 약 48 % 이상 증가하였다.'??
Abstract
The red emission properties of Mn4+ doped SrAl12O19 prepared by the solid-state reaction was investigated, inorder to verify its potential to act as the red emitting phosphor of white LEDs. The emision spectrum exhibits a narrowband between 600~700 nm with four sharp peaks occurring at about 643, 656, 66, 671 nm due to the 2E→4A2 transitionof Mn4+. The excitation spectrum exhibits a broad band betwen 20~500 nm with three peaks occuring at about 338, 398and 468 nm, respectively. Moreover, the relative emission intensity of SrAl12O19 :Mn4+ with or without CaF2 and MgOfluxes measured at excitation source 390 nm. The relative emission intensity of SrAl12O19 :Mn4+ containing 0.67 mol% MgOwas aproximately 30 % higher than that of the base composition sample. Strontium hexa-aluminate measured at roomtemperature as a function of the substituted Mg concentration. MgO was aded to replace part of the Al2O3. Also, therelative emission intensity of SrAl12O19 :Mn4+ containing 0.67 mol% MgO and 0.67 mol% CaF2 was approximately about48 % higher than that of the base composition SrAl12O19:Mn4+.Key words SrAl12O19 :Mn4+, Red phosphor compensate effect, Luminescence, Mn4+ transition, White LEDsSrAl12O19:Mn4+.. .... .... Mn ... .. .. . ....
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