Garnet 구조의 새로운 color-tunable 형광체와 근자외선 LED를 이용한 고품질 백색 LED 구현 Photoluminescence properties and Energy transfer in color-tunable CaGd2ZrScAl3O12:Ce3+,Tb3+,Pr3+ garnet phosphor for high quality LED lighting원문보기
김보영
(Chonnam National University
Department of Materials Science and Engineering
국내석사)
Recently, white light-emitting diode (WLED)-based lighting have received greater interest for display and lighting applications, due to their lower energy consumption, good reliability, long lifetime, and environmental friendliness. WLED light source is generated by the coupling of blue InGaN LED (e...
Recently, white light-emitting diode (WLED)-based lighting have received greater interest for display and lighting applications, due to their lower energy consumption, good reliability, long lifetime, and environmental friendliness. WLED light source is generated by the coupling of blue InGaN LED (excitation source) with a Y3Al5O12:Ce3+ (YAG:Ce3+) yellow phosphor (emitting center) which is currently employed in the lighting technology. The performance of phosphor-converted W LED (pc-WLED) has been improved mainly by diversifying the components, encapsulation of the device, phosphor synthesis, as well as designing new strategies for the development of phosphors. Since, YAG:Ce3+ an substantive emitting layer in the fabrication of pc-WLED was patented by Nichia corporation, this would lead to a patent infringement along with its poor color rendering property. An alternative way to overcome these difficulties is to combine near ultraviolet (near-UV) LEDs (300 to 410 nm) with blue/green/red tricolor phosphors because these provide high color rendering indexes and excellent light output performances. However, considerable reabsorption and the complicated design of multiple phosphors causes low luminescence efficiency. Nowadays, single composition white-emitting phosphors which are excited by UV-or blue LED have been developed to prevent the reabsorption, instability of color temperature, and cost issues. In Chapter 2, we report a partially substituted CaGd1.96Ce0.04ZrSc(AlO3)4 phosphor with Tb3+ and Pr3+ as green and red component. A green-emitting CaGd1.47Ce0.04Tb0.49ZrSc(AlO3)4 and white-emitting CaGd1.94Ce0.04Pr0.02ZrSc(AlO3)4 phosphor was synthesized by a solid-state reaction, exhibiting an efficient green emission and red emission at 543 nm and 609 nm under blue excitation. The structural and optical properties of CGZSA:Ce3+,Tb3+/Pr3+ phosphor as well as their decay time was investigated. The partial substitution of Tb3+ and Pr3+ in CaGd1.47Ce0.04Tb0.49ZrSc(AlO3)4 led to considerable broad emission spectrum. The white light-emitting diode (LED) was fabricated using PIG (phosphor -in-glass) with a blue LED chip. The LED showed warm white light with an excellent color rendering index of 92. The CGZSA:Ce3+,Tb3+,Pr3+ is thus a potential green and white-emitting phosphor for LED lighting
Recently, white light-emitting diode (WLED)-based lighting have received greater interest for display and lighting applications, due to their lower energy consumption, good reliability, long lifetime, and environmental friendliness. WLED light source is generated by the coupling of blue InGaN LED (excitation source) with a Y3Al5O12:Ce3+ (YAG:Ce3+) yellow phosphor (emitting center) which is currently employed in the lighting technology. The performance of phosphor-converted W LED (pc-WLED) has been improved mainly by diversifying the components, encapsulation of the device, phosphor synthesis, as well as designing new strategies for the development of phosphors. Since, YAG:Ce3+ an substantive emitting layer in the fabrication of pc-WLED was patented by Nichia corporation, this would lead to a patent infringement along with its poor color rendering property. An alternative way to overcome these difficulties is to combine near ultraviolet (near-UV) LEDs (300 to 410 nm) with blue/green/red tricolor phosphors because these provide high color rendering indexes and excellent light output performances. However, considerable reabsorption and the complicated design of multiple phosphors causes low luminescence efficiency. Nowadays, single composition white-emitting phosphors which are excited by UV-or blue LED have been developed to prevent the reabsorption, instability of color temperature, and cost issues. In Chapter 2, we report a partially substituted CaGd1.96Ce0.04ZrSc(AlO3)4 phosphor with Tb3+ and Pr3+ as green and red component. A green-emitting CaGd1.47Ce0.04Tb0.49ZrSc(AlO3)4 and white-emitting CaGd1.94Ce0.04Pr0.02ZrSc(AlO3)4 phosphor was synthesized by a solid-state reaction, exhibiting an efficient green emission and red emission at 543 nm and 609 nm under blue excitation. The structural and optical properties of CGZSA:Ce3+,Tb3+/Pr3+ phosphor as well as their decay time was investigated. The partial substitution of Tb3+ and Pr3+ in CaGd1.47Ce0.04Tb0.49ZrSc(AlO3)4 led to considerable broad emission spectrum. The white light-emitting diode (LED) was fabricated using PIG (phosphor -in-glass) with a blue LED chip. The LED showed warm white light with an excellent color rendering index of 92. The CGZSA:Ce3+,Tb3+,Pr3+ is thus a potential green and white-emitting phosphor for LED lighting
※ AI-Helper는 부적절한 답변을 할 수 있습니다.