Viability of 3D Printing LED TV screens

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Semiconducting Materials

For the manufacturing of quantum dot LED (QLED) displays, the quantum dots will have been created prior to 3D printing. The quantum dots will be made of the semiconductor, cadmium selenide/zinc sulfide (CdSe/ZnS), which consists of CdSe core and a ZnS shell. The ZnS shell on the quantum dot acts as a protective barrier between the core, which is responsible for optical emission, and the surrounding material ^[1]. Four sizes of quantum dots corresponding to four colors of emitted light will be purchased from mkNano.

The CdSe/ZnS quantum dots will be 3D printed on a crystalline ZnO wafer which will act as the electron injection layer. ZnO was chosen for its favorable band gap energy and work function ^[2]. The ZnO wafer substrate will be purchased from Precision Micro-Optics.

3D Printing CdSe/ZnS Quantum Dots

The focus of this project is on the viability of 3D printing the quantum dot layer (CdSe/ZnS) on the electron injection layer (ZnO wafer). The other layers (cathode, hole injection layer, anode) are beyond the scope of this project. Steps involving the other layers are for clarity only.

Note: All the quantum dot colors could not all be purchased from the same manufacturer. MkNano did not offer a small enough quantum dot to emit blue light.

Steps:

• Acquire materials
  • CdSe/ZnS quantum dots (in methanol)-red, yellow, orange, and green mkNano.
  • CdSe/ZnS quantum dots- blue Sigma Aldrich.
• 3D print the cathode layer to the desired size
• 3D print the electron injection layer (ZnO crystalline wafer Precision Micro-Optics) on top of the cathode
  • The electron injection layer will be 20 mm x 20 mm
• Package the 5 quantum dot colors onto a vehicle (much like an inkjet printer)
• Print the quantum dots into a display array
• 3D print a hole injection layer onto the quantum dot layer
• Print the final transparent anode layer onto the hole injection layer

Materials Saftey Data Sheets

Chemicals & Compounds Used

• Methanol
• ZnO
• CdSe/ZnS quantum dots (in methanol)

Project goals

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Design

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Costs

Material	Unit Price	Total Price
CdSe/ZnS*	.....	.....
ZnO wafer	.....	.....
		.....

prepared in methanol*

Discussion

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References

Contact details

Ajmcquar Kmwhalen Shaneamtu

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