Advertisement
Grab your lab coat. Let's get started
Welcome!
Welcome!
Create an account below to get 6 C&EN articles per month, receive newsletters and more - all free.
It seems this is your first time logging in online. Please enter the following information to continue.
As an ACS member you automatically get access to this site. All we need is few more details to create your reading experience.
Not you? Sign in with a different account.
Not you? Sign in with a different account.
ERROR 1
ERROR 1
ERROR 2
ERROR 2
ERROR 2
ERROR 2
ERROR 2
Password and Confirm password must match.
If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)
ERROR 2
ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.
Nanomaterials
Chemistry In Pictures
Chemistry in Pictures: All hail halides
by Alexandra Taylor
March 27, 2019
These flasks all contain CsPbBr3 nanocrystals excited with an ultraviolet lamp. The size of the crystals dictates what color they glow when excited. The second flask from the left contains small particles, while the third from the left contains large particles, making it a bright green. The flasks on the ends both contain the same material as the bright green flask, but they’ve been mixed with lithium chloride (left) and lithium iodide (right) to turn the contents blue and orange, respectively. Florida State University chemistry professor Lea Nienhaus and her group tuned the emission colors of the perovskite nanocrystals through a process called halide exchange. “Halide ions are highly mobile in perovskites, so we can replace them by simply adding an excess of a new halide into the flask, and the color will rapidly change,” Nienhaus explains. She set pipettes containing the CsPbBr3 starting material into the flasks after adding the halides. The ions slowly diffused up the pipette capillary, creating the deep blue to light blue and orange to green transitions shown. Nienhaus’s group aims to better understand the fundamental properties of perovskites for applications in solar energy harvesting, lighting, and energy conversion.
Submitted by Lea Nienhaus
Do science. Take pictures. Win money. Enter our photo contest here.
Related C&EN Content:
You might also like...
The power is now in your (nitrile gloved) hands
Sign up for a free account to get more articles. Or choose the ACS option that’s right for you.
Already have an ACS ID? Log in
Join the conversation
Contact the reporter
Submit a Letter to the Editor for publication
Engage with us on Twitter