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1 please describe the lighting history 2 please describe

1. Please describe the lighting history.

2. Please describe the lighting principle of PN junction based solid state lighting.

3. The bandgap energy of E_g of Ga1-xAlxAs depends on x through the following approximate equation Eg (x) = (1.424 + 1.247x)eV. Please calculate the bandgap energy and the corresponding output wavelengths for x = 0.1 and 0.5.

4. What is the function of hetereo structure for LED?

5. What is the function of quantum well for LED?

6. How to adjust the bandgap of LED?

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Chemistry: 1 please describe the lighting history 2 please describe

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