Read the following text and answer the following questions on the basis of the same:
Light Emitting Diode:
It is a heavily doped p-n junction which under forward bias emits spontaneous radiation. The diode is encapsulated with a transparent cover so that emitted light can come out. When the diode is forward biased, electrons are sent from n `to` p (where they are minority carriers) and holes are sent from p`to`n(where they are minority carriers). At the junction boundary, the concentration of minority carriers increases as compared to the equilibrium concentration (i.e., when there is no bias).
Thus at the junction boundary on either side of the junction, excess minority carriers are there which recombine with majority carriers near the junction. On recombination, the energy is released in the form of photons. Photons with energy equal to or slightly less than the band gap are emitted. When the forward current of the diode is small, the intensity of light emitted is small. As the forward current increases, intensity of light increases and reaches a maximum. Further increase in the forward current results in decrease of light intensity. LED's are biased such that the light emitting efficiency is maximum.
The V-I characteristics of a LED is similar to that of a Si junction diode. But, the threshold voltages are much higher and slightly different for each colour. The reverse breakdown voltages of LED's are very low, typically around 5 V. So care should be taken that high reverse voltages do not appear across them. LED's that can emit red, yellow, orange, green and blue light are commercially available.
Threshold voltage of LED is:

Options

A. lower compared to other p-n junction diodes and slightly different for each colour.
B. higher compared to other p-n junction diodes and slightly different for each colour.
C. higher compared to other p-n junction diodes and same for all colours.
D. lower compared to other p-n junction diodes and same for all colours.

Explanation

To determine the threshold voltage of a Light Emitting Diode (LED) based on the provided text, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept of Threshold Voltage**:
- The threshold voltage of a diode is the minimum voltage that must be applied to the diode in the forward direction to allow current to flow through it and to begin emitting light in the case of an LED.

2. **Analyzing the Information Provided**:
- The text states that the threshold voltages of LEDs are "much higher" compared to other p-n junction diodes. This indicates that LEDs require a higher voltage to operate effectively.

3. **Considering Variability with Color**:
- It is also mentioned that the threshold voltages are "slightly different for each color." This implies that different colors of LEDs (like red, yellow, green, etc.) have different threshold voltages due to variations in their material properties and band gaps.

4. **Evaluating the Options**:
- The options provided are:
1. Lower compared to other PN Junction Diodes and slightly different for each color.
2. Higher compared to other PN Junction Diodes and slightly different for each color.
3. Higher compared to other PN Junction Diodes and same for all colors.
4. Lower compared to other PN Junction Diodes and same for all colors.
- From our analysis, the correct statement should reflect that the threshold voltage is higher than that of other p-n junction diodes and varies with color.

5. **Selecting the Correct Answer**:
- Based on the analysis, the correct answer is: **Higher compared to other PN Junction Diodes and slightly different for each color**.

### Final Answer:
The threshold voltage of an LED is **higher compared to other PN junction diodes and slightly different for each color**.

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