scholarly journals A review of leakage current mechanism in nitride based light emitting diode

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Anati Syahirah Hedzir ◽  
Norasmahan Muridan ◽  
Nurul Fadzlin Hasbullah
Keyword(s):  
Leakage Current ◽  
Light Emitting Diode ◽  
Forward Bias ◽  
Dominant Mechanism ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
High Bias ◽  
Assisted Tunneling ◽  
Leakage Current Mechanism ◽  
Current Mechanism

We review the dominant mechanism and characteristics of it which gave rise to the existence of forward and reverse leakage current in nitride based light emitting diode (LED). LED is one of the promising device to be used as a lighting source because it does not contain mercury unlike fluorescent lamps. However, the existence of leakage current can affect the reliability and efficiency of LED. Hence, its importance to understand the mechanism that responsible for its existence. The occurrence of leakage current is divided into three main parameters: 1) low bias; 2) medium or high bias; 3) temperature dependence. In low reverse bias, Poole-Frenkel is the dominant mechanism while tunneling is the dominant mechanism in high bias region. Furthermore, in forward bias, defect assisted tunneling is most likely the dominant mechanism. In low forward bias, electrons are the dominant carriers in defect assisted tunneling while in medium forward bias, holes are the dominant carriers.  Moreover, Variable Range Hopping (VRH) is reported to be dominant when the temperature of conduction is below 200K. 

scholarly journals Analysis of Energy and Cost Performance of Retrofitting Fluorescent Tubes with Compact Fluorescent and Light Emitting Diode Lamps

2020 ◽  
pp. 34-46 ◽  
Author(s):  
J. S. Adeleke ◽  
A. B. Wahab ◽  
E. A. Olanipekun
Keyword(s):  
Light Emitting Diode ◽  
Electricity Consumption ◽  
Poor Performance ◽  
Payback Period ◽  
Optimal Performance ◽  
Light Emitting ◽  
Tertiary Institutions ◽  
Fluorescent Lamps ◽  
Significant Difference ◽  
Compact Fluorescent Lamp

Over the years, visual comfort has been described as a major requirement needed to enhance optimal performance of occupants in any learning environment in tertiary institutions. This is reflected in the poor performance of the commonly used Fluorescent Lamps (FL) occasioned by its constant burn-off, high failure rate and reduced durability. Hence, there is a shift to the adoption of Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED). This study therefore examined the pattern of electricity consumption involving the adoption of FL, CFL and LED in the purposively selected lecture theatres of Obafemi Awolowo University, Ile-Ife, Nigeria. The study was carried out using energy monitor to obtain the consumption data of the lamps for periodic logging at intervals of 1 hr, 3 hrs, 6 hrs, 12 hrs, 1 day, 7 days, 1 month and 3 months respectively; and also to determine the payback period of each of the lamps. From the data collected, patterns of electricity used, electricity savings were calculated and compared to establish performance potentials of each of the lamps. The study found that there was a significant difference in the pattern of electricity consumption of FLs compared with that of CFLs and LEDs, but a reduced margin existed between CFLs and LED lamps. It showed that the FLs consumed 681.576 kWh, 1619.466 kWh and 5652.432 kWh, CFLs consumed 387.302 kWh, 692.479 kWh and 1936.600 kWh, while LED consumed 294.188 kWh, 426.608 kWh and 1499.015 kWh. There were significant differences in consumption with 43, 47 and 65% reduction in electricity consumption using CFLs while 57, 73 and 73% using LED fittings were obtained. The CFLs performed better in terms of return on investments by having a lower payback period when compared to LED. The study concluded that replacing FL with CFL and LED would be desirable option in order to enhance optimal performance of lecture theatres, but in terms of payback period, it would be beneficial to retrofit FLs with CFLs.

scholarly journals Heavy-Ion Microbeam Studies of Single-Event Leakage Current Mechanism in SiC VD-MOSFETs

2020 ◽  
Vol 67 (7) ◽  
pp. 1381-1389
Author(s):  
C. Martinella ◽  
T. Ziemann ◽  
R. Stark ◽  
A. Tsibizov ◽  
K. O. Voss ◽  
...  
Keyword(s):  
Leakage Current ◽  
Heavy Ion ◽  
Single Event ◽  
Leakage Current Mechanism ◽  
Current Mechanism

Oxygen Stability and Leakage Current Mechanism in Ferroelectric La-Substituted Bi4Ti3O12Single Crystals

2005 ◽  
Vol 44 (9B) ◽  
pp. 6998-7002 ◽  
Author(s):  
Yuji Noguchi ◽  
Masayuki Soga ◽  
Masatake Takahashi ◽  
Masaru Miyayama
Keyword(s):  
Leakage Current ◽  
Leakage Current Mechanism ◽  
Current Mechanism

The temperature-dependent luminescence properties of BaAl2−xSixO4−xNx:Eu2+ and its application in yellowish-green light emitting diode

2009 ◽  
Vol 24 (8) ◽  
pp. 2589-2595 ◽  
Author(s):  
Mei Zhang ◽  
Baohong Li ◽  
Jing Wang ◽  
Zhiyang Zhang ◽  
Qiuhong Zhang ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Forward Bias ◽  
Green Light ◽  
Thermal Quenching ◽  
Energy Shift ◽  
Light Emitting ◽  
Yellowish Green ◽  
Near Ultraviolet ◽  
Increasing Temperature ◽  
Cation Sites

The influences of (SiN)+ and Eu2+ concentration on the optical properties of BaAl2−xSixO4−xNx:Eu2+ were investigated. The lifetime results show that there are two different cation sites occupied by Eu2+ ions and the energy transfer occurs between them. The Huang–Rhys factor and the Stokes energy shift were determined, and thermal quenching with increasing temperature was observed. Finally, intense yellowish-green light emitting diodes (LED) with the color coordinate of (0.2936, 0.4483) under a forward-bias current of 20 mA was successfully fabricated on the basis of a structure consisting of BaAl2−xSixO4−xNx:Eu2+ phosphor and near-ultraviolet (∼395 nm) GaN chip.

Light Emitting Diode Technology: Lowering Build and Maintenance Costs

2013 ◽  
Author(s):  
Roger Buelow ◽  
Keith Kazenki ◽  
Greg Flies
Keyword(s):  
Energy Efficient ◽  
Light Emitting Diode ◽  
Efficient Technology ◽  
Maintenance Costs ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Feasible Option ◽  
Energy Efficient Technology

Due to the recent push for energy efficient technology, LEDs have developed to be able to meet and surpass fluorescent lamps in terms of efficiency and lifetime. Additional focus on LEDs has allowed the initial investment price to decrease allowing LEDs to become a feasible option. Installing LEDs during the construction of ships allows for a greater TOC savings from increased energy efficacy, lower maintenance costs and a simpler electrical design schematic. There are three options available to incorporate LEDs on a ship: LED lamps, LED fixtures or a combination of the two.

Sign in / Sign up

Export Citation Format

Share Document