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Concept explainers
Interpretation:
The correct match of energy level diagram for blue and red LEDs should be determined.
Concept introduction:
The quantum dots of any solids can be defined as the semiconductor particles that have size in nanoparticle range and changes color with change in diameter of particles. These quantum dots are used in solar cells, LEDs, quantum computing, medical imaging. Since size of nanoparticle is intermediate between the bulk solids and atoms thus the spacing between electronic energy also has intermediate value between large for atoms and continuous band for bulk solids. Therefore, spacing between bands depends on size of nanoparticle. These different energy gaps can create valence band and conduction band and can give different colors on transition.
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Chapter 12 Solutions
CHEMISTRY-TEXT
- The elements Cu, O, La, Y, Ba, Tl, and Bi are all found in high-temperature ceramic superconductors. Write the expected electron configuration for these atoms.arrow_forward8.96 A business manager wants to provide a wider range of p- and n-type semiconductors as a strategy to enhance sales. You are the lead materials engineer assigned to communicate with this manager. How would you explain why there are more ways to build a p-type semiconductor from silicon than there are ways to build an n-type semiconductor from silicon?arrow_forward25. It is possible to measure the way light interacts with a material. In one lab we looked at how much light is transmitted through a colored solution. Since different wavelengths of light have diferent energies, we can interpret some of the energies involved in these compounds. a) What is the "opposite" of percent transmission (%T)? b) What does the visible spectrum of a material, especially that from a complex compound of a transition metal, tell us about the material? c) Describe a way to measure the spectrum of a solution. d) Is it possible to use the spectra of different materials to identify them? How?arrow_forward
- In a copper-plating experiment, the experimental amount of mass of copper deposited is 2.0 grams. The amount of current supplied is 1.5 A and time elapsed is 4000 seconds. The correct equation for determining the theoretical amount of mass of copper deposited is shown below. What is the theoretical amount of mass deposited? (MM of Cu = 63.55 g/molarrow_forwardMn^2+orbital filling diagramarrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning
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