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소개 및 활동/사업
역대 학회상 수상자
대한화학회 창립 75주년
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02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Improvement of luminous efficiency of NaYF
: Yb, Er upconversion films using silver deposition
2018년 2월 13일 13시 10분 17초
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4월 20일 (금요일) 11:00~12:30
, Youngho Cho
, Chan Ryang Park
, Hyung Min Kim
Department of Bionano Chemistry, Kookmin University, Korea
Department of Chemistry, Kookmin University, Korea
Some rare earth metals have a feature that has an optical phenomenon called upconversion (Upconversion; UC). This phenomenon occurs when two or more photons are absorbed in the excited state and emit light at a higher energy than the incident light. Typical upconversion materials comprise NaYF
as a host and include rare earth metals such as Yb and Er. Using these characteristics, it has been used in solar cells, displays and the development of lasers laser. Recently, it has been used for biomedical image research using UCNP (upconversion nano particles; UCNP). In addition, when a transparent film having a pattern is formed using an UC material, the information is recognized only when the light in the infrared region is irradiated. Therefore, it is expected to be used in the field of security, information and anti-counterfeiting. By using PLD method (pulsed laser deposition; PLD), it was made easier than existing upconversion film making method and succeeded in manufacturing transparent film by adjusting refractive index of film. However, due to the low quantum efficiency of the UC material itself, a high power light source was required to obtain the information of the film. To overcome this problem, when the substrate of the film is not damaged at high temperature, the film is annealed by exposing it to high temperature to improve the crystallinity of the UCF (upconversion film; UCF) and improve the efficiency by removing the defect site. On the other hand, when the film is like a thin plate, there is a problem in that the film is damaged and information is deformed by using the above method. In this case, when a metal layer is formed during film production, the luminous efficiency of the film is increased due to the surface plasmon resonance effect. Silver was used as the metal, and the experiment was classified into three kinds according to the position of the SL (silver layer; SL). First, the SL under the UCF was formed, then the SL was formed on the UCF, and finally the silver and UC materials were simultaneously deposited.
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