Question: The first LEDs were made from GaAs, which has a band gap of 1.43 eV. What wavelength of light would be emitted from an LED

The first LEDs were made from GaAs, which has a band gap of 1.43 eV. What wavelength of light would be emitted from an LED made from GaAs? What region of the electromagnetic spectrum does this light correspond to: UV, visible, or IR?

Step by Step Solution

★★★★★

3.37 Rating (178 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

The band gap D E of GaAs is 143 eV The visible portion ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

876-C-P-c-L-A-S (374).docx

120 KBs Word File

Students Have Also Explored These Related Physical Chemistry Questions!

Red light-emitting diodes are made from GaAs and GaP solid solutions, GaPxAs1-x (see Exercise 12.73). The original red LEDs emitted light with a wavelength of 660 nm. If we assume that the band gap...

Pure germanium has a band gap of 0.67eV. The Fermi energy is in the middle of the gap. (a) For temperatures of 250 K, 300 K, and 350 K, calculate the probability f(E) that a state at the bottom of...

Germanium has a band gap of 0.67eV. Doping with arsenic adds donor levels in the gap 0.01eV below the bottom of the conduction band. At a temperature of 300 K, the probability is 4.4 x 10-4 that an...

The semiconductor CdSe has a band gap of 1.74 eV. What wavelength of light would be emitted from an LED made from CdSe? What region of the electromagnetic spectrum is this?

PXT992 Research Project Plan Degradation Mechanisms in Quantum Dot on Silicon Lasers Author 1 Purpose (motivation) One of the most urgent issues in semiconductor technology is the direct development...

I need a Gantt chart or similar timetable briefly outlining what & when you will be doing, and more description on the process you will be following to complete these tasks. E.g. Pre-degradation...

Orange, red, and near-IR LEDs are often made from GaAs 1x P x solid solutions. For compositions with x

Answer the Activity 2 and the assignment part. 2. Click the lamp to turn on the light. When reading currents, click on the red button each time the brightness or color is changed. Read the texts so...

If we hold all other factors the same, an increase in interest rates will: a. Decrease the present value of a stream of constant payments we expect to receive. b. Increase the present value of a...

Write pseudocode for the procedures HEAP-MINIMUM, HEAP-EXTRACT-MIN, HEAP-DECREASE-KEY, and MIN-HEAP-INSERT that implement a min-priority queue with a min-heap.

In the context of computing a predetermined indirect cost rate, what is a cost driver?

Show that the product of two 2 2 skew symmetric matrices is diagonal. Is this true for n n skew symmetric matrices with n > 2? Discuss.

2. Distinguish between the meaning of the expressions change in demand and change in the quantity demanded. LO4

A multinomial experiment produced the following results: Category 1 2 3 Frequency 128 87 185 At the 1% significance level, can we reject H0: p1 = 0.30, p2 = 0.20, and p3 = 0.50? Applications

Calculate the amount of work input a refrigerator needs to make ice cubes out of a tray of 0.25 kg liquid water at 10oC. Assume the refrigerator works in a Carnot cycle between 8oC and 35oC with a...

A steel bottle V = 0.1 m3 contains R-134a at 20C, 200 kPa. It is placed in a deep freezer where it is cooled to -20C. The deep freezer sits in a room with ambient temperature of 20C and has an inside...

Liquid sodium leaves a nuclear reactor at 800C and is used as the energy souce in a steam power plant. The condenser cooling water comes from a cooling tower at 15C. Determine the maximum thermal...

Suppose that you own 2,800 shares of Nocash Corp. and the company is about to pay a 25% stock dividend. The stock currently sells at $125 per share. a. What will be the number of shares that you hold...

A company applies overhead using machine hours. Additional information follows. Standard variable overhead rate Actual variable overhead rate Standard hours of machine use ( for actual production )...

Reactive Power Generation has the following capital structure. Its corporate tax rate is 21%. Security Debt Preferred stock Common stock Market Value $ 10 million 30 million 60 million Required Rate...