The internal quantum efficiency of LEDs decreases _____ with temperature.
Exponentially increasing
Exponentially increasing option is correct.
The internal quantum efficiency (IQE) of an LED is the ratio of radiative recombination events to total recombination events inside the active region. Non-radiative recombination pathways such as Shockley-Read-Hall and Auger recombination are thermally activated, and their rates grow rapidly with lattice temperature.
As a result the IQE falls off with temperature \(T\) approximately as \(\eta(T)=\eta_{0}\exp(-T/T_{1})\) — an exponential decrease with increasing temperature. This is why high-power LEDs need aggressive heat sinking: even modest self-heating causes a disproportionate drop in radiative efficiency. Linear behaviour or a decrease of temperature does not match the measured IQE-versus-T characteristic of III-V LEDs.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
