• 제목/요약/키워드: $SrTiO_3$:Pr

검색결과 56건 처리시간 0.02초

Al과 Pr이 첨가된 SrTiO$_3$ 적색 형광체의 발광 특성 (The Luminescent Properties of SrTiO$_3$ :Al, Pr Red Phosphor)

  • 박정규;류호진;박희동;최승철
    • 한국세라믹학회지
    • /
    • 제36권5호
    • /
    • pp.478-482
    • /
    • 1999

  • SrTiO3 :Al, Pr phosphor as an oxide compound phosphor is expect to be applied for a field emission display(FED). In this phosphor the excitation spectrum shows a different tendency according to an addition Al3+ and Pr3+ In this excitation spectrum the main peak at 359 nm represent excitation level of Pr3+(1S0longrightarrow1D2 transition) and the absorption characteristic according to Ti/Sr molar ratio is influenced by the structure symmetry. The emission spectrum exhibits the red luminescence with the radiative decay of the 1D2 states(1D2 longrightarrow3H4 transition) The concentration quenching phenomena at 1D2 state shows up as Al3+ and Pr3+ ion concentration increases.

  • PDF

SrTiO$_3$:Pr$^{3+}$,Ga$^{3+}$ Phosphor의 발광특성에 관한 연구 (Luminesence Characteristics of SrTiO$_3$:Pr$^{3+}$,Ga$^{3+}$ Phosphor)

  • 이미애;남산;김명호;서경수;변재동
    • 한국세라믹학회지
    • /
    • 제35권7호
    • /
    • pp.757-763
    • /
    • 1998

  • The effect of {{{{ {Ga }^{3+ } }} addition on the photoluminescence and cathodoluminescence of {{{{ {SrTiO}_{3 } }}:{{{{ { Pr}^{3+ } }} was stu-died by performing the excitation emission and decay time measurements. Addition of {{{{ {Ga }^{3+ } }} in {{{{ {SrTiO}_{3 } }}:{{{{ { Pr}^{3+ } }} resulted in a considerable enhancement of {{{{ { Pr}^{3+ } }} emission intensity. From the analysis of the experimental results the following mechanism is proposed. Excitation in the {{{{ {SrTiO}_{3 } }} host lattice leads to the formation of electrons in the conduction band and holes in the valence band. The electrons in the conduction band re-combine radiatively with the holes trapped at {{{{ { Ga}^{3+ } }} and the energy is transferred to {{{{ { Pr}^{3+ } }} ion which give its own characteristic red emission.

  • PDF

$SrTiO_3$: $Pr^{3+}$,$Ga^{3+}$의 발광특성 (Photoluminescence of $SrTiO_3$: $Pr^{3+}$,$Ga^{3+}$)

  • 변재동;이용제;장보윤;이현덕;유영문;류선윤
    • 한국세라믹학회지
    • /
    • 제38권8호
    • /
    • pp.705-709
    • /
    • 2001

  • SrTiO$_3$에 Pr$^{3+}$ 이온, 또는 Pr$^{3+}$ 이온과 Ga$^{3+}$ 이온을 첨가하여 합성한 형광체와 floating zone method로 성장시킨 단결정의 PL 특성을 조사하였다. 분말 형광체와 단결정에서 모두 Ga$^{3+}$ 이온이 함께 첨가되었을 때 적색 발광 세기가 크게 증가하였다. XRF(X-Ray Fluorescence) 측정결과 Ga$^{3+}$ 이온이 함께 첨가되었을 때 SrTiO$_3$결정 격자내의 Pr$^{3+}$ 이온의 농도가 증가하였다. Ga$^{3+}$ 이온이 함께 첨가되었을 때 적색 발광 세기가 증가하는 것은 첨가된 Ga$^{3+}$ 이온이 결정내 발광 center인 Pt$^{3+}$ 이온의 농도가 증가시켰기 때문이며, 또한 Ga$^{3+}$ 이온이 hole trap center로 작용하기 때문인 것으로 생각된다.

  • PDF

Enhanced Luminescence of $SrTiO_3:Pr^{3+}$by Incorporating with $Li^+$ or $Na^+$Ion

  • Tian, Lianhua;Mho, Sun-Il;Bae, Hyun-Sook;Yu, Byung-Yong;Pyun, Chong-Hong
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
    • /
    • pp.819-821
    • /
    • 2002

  • Photoluminescenc (PL) and low-voltage cathodoluminescence (CL) characteristics of $[xSrTiO_3+(1-x)Li_2TiO_3]:Pr^{3+}$ and $[xSrTiO_3+(1-x)Na_2TiO_3]:Pr^{3+}$ systems were investigated. The red luminescence intensities of these compounds are enhanced remarkably by the incorporation of $Li^+$ or $Na^+$ ion as compared to that of $SrTiO_3:Pr^{3+}$. The enhanced luminescence is speculated to result from both the charge compensation of $Pr^{3+}$ site and oxygen vacancies generated in the lattices by $Li^+$ or $Na^+$ ion.

  • PDF

${Sr_{1-x}}{Ca_x}{TiO_3}$$_3$:$Pr^{3+}$,$Ga^{3+}$ 형광체의 발광메커니즘 (The Luminescence Mechanism of ${Sr_{1-x}}{Ca_x}{TiO_3}$$_3$:$Pr^{3+}$,$Ga^{3+}$ Phosphor)

  • 장보윤;이용제;이현덕;변재동
    • 한국세라믹학회지
    • /
    • 제38권2호
    • /
    • pp.107-111
    • /
    • 2001

  • Sr$_{(1-x)}$Ca$_{x}$TiO$_3$: Pr$^{3+}$ , Ga$^{3+}$ (0$\leq$x$\leq$1) 형광체의 여기 및 발광 스펙트럼과 분광 반사율을 조사하여 발광 메커니즘을 규명하고자 하였다. 발광 스펙트럼에서는 611~614nm 사이에서 peak을 가지는 하나의 적색 발광 밴드가 관찰되었으며, 조성에 따라 발광밴드의 모양이 달랐다. 이는 조성에 따른 모체의 결정 구조 변화 때문으로 생각된다. 여기 스펙트럼 끝단과 분광 반사율 스펙트럼의 흡수단은 서로 일치하였으며, 이 결과로부터 모체에 흡수된 에너지가 Pr$^{3+}$ 에 전달되어 적색광을 방출하는 것이 주된 메커니즘으로 생각된다. 한편 120$0^{\circ}C$에서 4시간동안 열처리하여 합성한 Sr$_{0.4}$Ca$_{0.6}$TiO$_3$:(0.1 mol%)Pr$^{3+}$ , (0.2 mol%)Ga$^{3+}$ 는 우수한 색순도와 휘도를 나타내었다.다.

  • PDF

졸-겔법에 의한 $SrTiO_3:Pr^{3+}$ 형광체의 $SiO_2$ 및 $Al_2O_3$ 코팅에 따른 발광특성 (Luminescent Properties of $SrTiO_3:Pr^{3+}$ Phosphor Coated with $SiO_2$ and $Al_2O_3$ by Sol-Gel Method)

  • 이동규;임문혁;이진화;김태영
    • 한국응용과학기술학회지
    • /
    • 제23권3호
    • /
    • pp.243-251
    • /
    • 2006

  • Field emission display(FED) is actively investigated in view of the development of full color flat-panel display, which can replace some cathode-ray tube(CRT). Thus, the development of new phosphors appropriate for FED is urgently needed and has been actively investigated. In this work, $SrTiO_3:Pr^{3+}$ phosphor was prepared by sol-gel method and the coating was applied by sol-gel method combined with sonication on these phosphor's surface into diluted precursor solution. It was found that very fine particles of coating material were formed on phosphor's surface. The luminescent intensity of $SrTiO_3:Pr^{3+}$ phosphor coated with $SiO_2$ and $Al_2O_3$ was considerably increased without any noticeable change in color chromaticity. The optimum concentration of coating material was found to be 1wt% and the optimum pH value of the solution was 10.

  • https://doi.org/10.12925/jkocs.2006.23.3.10 인용 PDF KSCI