Theoretical analysis of 1.55-μm InAs/InP (113B) quantum dot lasers based on a multi-population rate equation model

2009 ◽  
Author(s):  
F. Grillot ◽  
K. Veselinov ◽  
M. Gioannini ◽  
R. Piron ◽  
E. Homeyer ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Quantum Dot ◽  
Rate Equation ◽  
Equation Model ◽  
Quantum Dot Lasers ◽  
Rate Equation Model ◽  
Population Rate

scholarly journals Efficiency Droop and Effective Active Volume in GaN-Based Light-Emitting Diodes Grown on Sapphire and Silicon Substrates

2019 ◽  
Vol 9 (19) ◽  
pp. 4160 ◽  
Author(s):  
Ryu ◽  
Ryu ◽  
Onwukaeme
Keyword(s):  
Quantum Well ◽  
Rate Equation ◽  
Equation Model ◽  
Efficiency Droop ◽  
Internal Electric Field ◽  
Active Volume ◽  
Light Emitting ◽  
Rate Equation Model ◽  
Sapphire Substrates ◽  
The Difference

We compared the efficiency droop of InGaN multiple-quantum-well (MQW) blue light-emitting diode (LED) structures grown on silicon(111) and c-plane sapphire substrates and analyzed the efficiency droop characteristics using the rate equation model with reduced effective active volume. The efficiency droop of the LED sample on silicon was observed to be reduced considerably compared with that of the identical LED sample on sapphire substrates. When the measured external quantum efficiency was fitted with the rate equation model, the effective active volume of the MQW on silicon was found to be ~1.45 times larger than that of the MQW on sapphire. The lower efficiency droop in the LED on silicon could be attributed to its larger effective active volume compared with the LED on sapphire. The simulation results showed that the effective active volume decreased as the internal electric fields increased, as a result of the reduced overlap of the electron and hole distribution inside the quantum well and the inhomogeneous carrier distribution in the MQWs. The difference in the internal electric field of the MQW between the LED on silicon and sapphire could be a major reason for the difference in the effective active volume, and consequently, the efficiency droop.

A rate equation model for the energy transfer mechanism of a novel multi-color-emissive phosphor, Ca1.624Sr0.376Si5O3N6:Eu2+

2019 ◽  
Vol 6 (12) ◽  
pp. 3493-3500
Author(s):  
Jin Hee Lee ◽  
Satendra Pal Singh ◽  
Minseuk Kim ◽  
Myoungho Pyo ◽  
Woon Bae Park ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rate Equation ◽  
Equation Model ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Rate Equation Model ◽  
Broadband Emission

A novel multi-color-emissive phosphor (Ca1.624Sr0.376Si5O3N6:Eu2+) and a rate equation model to elucidate the mechanism of energy-transfer leading to broadband emission.

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