Influence of Annealing Temperature and Time on the Photoluminescence and the Structure of Y$_2$O$_3$:Eu Thin Films
Jin Yeong Jeong, Joo Han Kim
Department of Advanced Materials Engineering, Chungbuk National University, Cheongju 28644, Korea
In the paper, the influences of annealing temperature and holing time on the photoluminescence and structure of Y$_2$O$_3$:Eu thin films are reported. The Y$_2$O$_3$:Eu films had a cubic Y$_2$O$_3$ structure textured with the (222) plane. PL was observed from the annealed films, attributed to the radiative relaxation of the 4f$^6$ orbital electrons from $^5$D$_0$ to $^7$F$_J$ multiplets in Eu$^{3+}$ ions. The PL intensity enhanced as the annealing temperature was increased, resulting from the improved crystalline quality of the films. The PL intensity of the 1200$^\circ$C-annealed films was decreased for longer holding time resulting from the formation of the Y$_2$SiO$_5$ phase.
J. Korean Phy. Soc. 2019; 74: 379-383  https://doi.org/10.3938/jkps.74.379
A Dielectric-Modulated Normally-Off AlGaN/GaN MOSHEMT for Bio-Sensing Application: Analytical Modeling Study and Sensitivity Analysis
S. N. Mishra1, K. Jena2
1School of Electronics Engineering, KIIT (Deemed to be University), Odisha 751024, India
2Department of ECE, LNM Institute of Information Technology, Jaipur, Rajasthan 302031, India
The manuscript describes the working principle of a normally-off AlGaN/GaN MOSHEMT based biosensor for level free electrical detection of biomolecules with the aid of an analytical model developed for device electrostatics parameter, such as change in threshold voltage. The analytical model provides insight in to the device physics, in depth knowledge about the theory behind the quantum mechanical operations of the GaN based MOSHEMT, an introduction to the target biomolecules and their significance to the human immune system. This work may be very beneficial for society as a huge market for biosensors exists in the health and the food industries.
J. Korean Phy. Soc. 2019; 74: 349-357  https://doi.org/10.3938/jkps.74.349
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