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Activation energy standardization of White LED Phosphor  

Jang, In-Hyeok (Chosun University)
Kim, Su-Kyoung (Korea Testing Certification)
Han, Ji-Hoon (Korea Testing Certification)
Lee, Chang-Hoon (Korea Testing Certification)
Lim, Houng-Woo (Korea Testing Certification)
Publication Information
Journal of Applied Reliability / v.13, no.2, 2013 , pp. 117-127 More about this Journal
Abstract
In this paper, we studied the correlation between the activation energy($E_a$) of the raw materials and the structural characteristics of the White LED PKGs. The samples used in the study were composed of low power LED 3type and high power LED 5type. To calculate the activation energy($E_a$) of the White LED PKGs conducted three conditions of high temperature operation test based on the Arrhenius model. The number of samples used in the experiment is 10, respectively. The $T_j$ of Conditions and target specifics expressed $T_{j1}$, $T_{j2}$, $T_{j3}$. The activation energy ($E_a$) of the samples was calculated based on the value of the actually measured lifetime. We investigated the correlation between the activation energy ($E_a$) of the raw materials and the structural characteristics of the White LED PKGs. As a result, White LED PKGs activation energy($E_a$) value was confirmed that the material properties affected more than the structural characteristics of the LED PKGs and we found that activation energy of each LED Model has difference. Normally, The activation energy of phosphor of YAG type was indicated from 0.21 to 0.25[eV] and Silicate type was indicated from 0.12 to 0.16[eV]. According to the results, we confirmed that the activation energy of phosphor of YAG type is higher more than The activation energy of phosphor of Silicate type.
Keywords
Activation energy; Arrhenius model; Silicate; YAG; White LED;
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