Synthesis of phosphors by wet-chemical reaction method and their application to electroluminescence device = 용액 공정법을 통한 형광체의 합성 및 이를 이용한 전계발광소자로의 응용

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In this thesis, various sized phosphor materials were synthesized using wet-chemical reaction method. At first, ZnS-based nanocrystals (NCs) were synthesized using chemical co-precipitation method and investigated its luminescence properties. To enhanced photoluminescence of the synthesized ZnS-based NCs passivation was attempted by using polyacrylic acid (PAA). Furthermore, novel white-emitting ZnS-based NCs were synthesized successfully by doping co-activators such as, Cu and Mn ions and it was found that the white emission of the ZnS:Cu,Cl,Mn NCs can be controlled by energy transfer from Cu to Mn2+ ion. The chemical co-precipitation synthesis method can be controlled the concentration of co-activators in ZnS host lattice easily compared to solid-state reaction method. The synthesized powder typed-ZnS NCs were used as emitting layer for EL device and their electroluminescence properties was investigated. For the extension of wet-chemical synthesis method to synthesis of oxide-based phosphor materials for white LED application, in this thesis, a novel various color-emitting Na2-xAl2-xSixO4:Eu2+ (0 ≤ x ≤ 1) phosphors and yellow-emitting Na3K(Si1-xAlx)8O16±δ:Eu2+ (0.44 ≤ x ≤ 0.60) phosphor were synthesized by using sol-gel method based on the hydrolysis of tetraorthosilicate (TEOS). In our experiment, it was very difficult to synthesize the complicated composition of phosphors such as Na2-xAl2-xSixO4:Eu2+, Na3K(Si1-xAlx)8O16±δ:Eu2+ phosphors through conven-tional solid-state reaction method; however, the Na2-xAl2-xSixO4:Eu2+, Na3K(Si1-xAlx)8O16±δ:Eu2+ phosphors was successfully synthesized by using wet chemical reaction method. The white LEDs combining near-UV LEDs with these phosphors were fabricated and their luminescent properties were investigated. In chapter 3, Color changeable ZnS based-NCs with various co-activator, such as Cu, Cl, Mn, Fe, were synthesized by solution reaction method successfully. The synthesized ZnS based-NCs showed ~ 3 nm of crystall...
Advisors
Jeon, Duk-Youngresearcher전덕영
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
568104/325007  / 020085197
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2012.2, [ xviii, 204 p. ]

Keywords

phosphor; 백색 발광 소자; 광발광; 용액 공정법; 신조성; 형광체; new composition; solution synthesis method; photoluminescence; white emitting device

URI
http://hdl.handle.net/10203/197315
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=568104&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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