Synthesis of Luminescent Hybrid Materials Material Research Lab - - PowerPoint PPT Presentation

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Feb 16, 2023 46 likes •179 views

Synthesis of Luminescent Hybrid Materials Material Research Lab UCSB INSET Intern : Susan Kapas Ventura Community College Major: Biopsychology Mentor : Neeraj Sharma Faculty Advisor : Prof. Tony Cheetham Funding : Mitsubishi Chemical Company

SLIDE 1

Synthesis of Luminescent Hybrid Materials

Material Research Lab

UCSB

INSET Intern: Susan Kapas

Ventura Community College

Major: Biopsychology

Mentor: Neeraj Sharma Faculty Advisor: Prof. Tony Cheetham Funding: Mitsubishi Chemical Company

SLIDE 2

Hg-based fluorescent lamps

Environmental pollution; Decrease power consumption; Longer life

Future /Upcoming Tech GaN

REASON FOR THE RESEARCH

Hg Phosphor visible

254nm

GaN Hybrid Material visible

360nm- 400nm

Why change?

SLIDE 3

Objective: Approach:

Synthesis of materials containing lanthanide

ions (La, Gd) by hydrothermal synthesis

Studying luminescent properties of doped

compounds

To Make Luminescent Inorganic-

Organic Hybrid Materials

SLIDE 4

HYDROTHERMAL SYNTHESIS

pTFE Stainless steel

What is Hydrothermal Synthesis?
Combining reactants
Autoclave
Heat 200°C ~ 2,3 days
Filter Material
PROCEDURE:
Moderate Temperature
Autogenous Pressure

SLIDE 5

Characterization:

Single-crystal X-ray diffraction
Powder X-ray diffraction
Thermogravimetric Analysis
Photoluminescence

Synthesized Samples:

SLIDE 6

Powder X-ray diffraction

Cu source (λ = 1.5418 Å)

X-RAY SOURCE SAMPLE PLATFORM DETECTOR

Bragg’s Law: nλ=2d(sinθ)

SLIDE 7

Powder XRD scan

XRD SK04

100 200 300 400 500 600 700 800 900 5 7 9 11 13 15 17 19 21 23 25 27 29 2Theta C/sec

SLIDE 8

Single Crystal X-ray diffraction

SK04 1mmol La(NO3)3.6H2O : 2mmol 5-sulfo-isophthalic acid Water, NaOH T = 180°C/2days

Mo source (λ = 0.71073Å)
0.1x 0.1 x 0.08mm

a = 7.1669(10) Å b = 8.3139(12) Å c = 16.8519(24) Å β = 97.5 °

SLIDE 9

SK29 SK30 SK29 SK30

UV Exc = 365nm No illumination

LUMINESCENCE

Goal:

R(Eu) + G(Tb) + B(Ce) = White light

.95mmol La(NO3)3.6H2O : 2mmol 5-sulfo-isophthalic acid .05mmol Europium(II) nitrate pentahydrate (SK29) .05mmol Terbium(III) nitrate pentahydrate (SK30)

SLIDE 10

Photoluminescence

SOURCE EXCITATION MONOCHRO- MATOR SAMPLING AREA EMISSION MONOCHRO- MATOR DETECTOR READ- OUT

SLIDE 11

Achievements: Future plans:

Synthesized new hybrid materials
Determined the single crystal structure of Lanthanum 5-

sulfoisophthalate

Studied the luminescent properties of Lanthanum 3,4-

pyridinedicarboxylate doped with Eu and Tb.

Study the structure and luminescent properties of
ther hybrid materials
Explore the thermal properties of some of them
Hopefully make the world glow through my materials

SLIDE 12

Acknowledgements

INSET program (Trevor Hirst, Nick Arnold, Mike Northen)
MRL (Prof. Tony Cheetham, Neeraj Sharma, Grady Snyder)
Funding (Mitsubishi Chemical Company, CNSI, NSF)

SLIDE 13

Bragg’s Law

θ – the scattering angle n – an integer representing the order

f the diffraction

d - distance

http://www.mrl.ucsb.edu/mrl/centralfacilities/xray/xray-basics/Xray-basics.html