Sensing Application

Emission spectra after mechanical grinding

CP1 ground powder series · Powder

Excitation at 390 nm; grinding times 0, 5, 10 and 15 min.

Geometry: Solid-state emission measurement.
Context: ground pristine CP1 powder
Measurement source: main p.7 / article p.347 · Results and discussion · Fig. 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Emission intensity response to grinding	Emission intensity decreases with grinding time from 0 to 15 min.	—	—	Text Qualitative	main p.7 / article p.347 · Results and discussion · Fig. 5

High-pressure hydrostatic luminescence spectroscopy

CP1 colourless needle-shaped single crystals · Single Crystal

Single crystal in mini-DAC; 375 nm laser excitation; ambient temperature; spectra collected at externally applied hydrostatic pressures during compression and decompression.

Temperature: 300
Atmosphere: 16:3:1 methanol-ethanol-water pressure transmitting medium for optical high-pressure measurements.
Geometry: Miniature diamond anvil cell with low-luminescence II-a diamonds; ruby R1 pressure calibration.
Context: pristine CP1 single crystal under hydrostatic pressure
Measurement source: main p.5 / article p.345 · Photophysical properties · Fig. 3 and Fig. 4

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
HE-band pressure red-shift slope	-452 cm^-1 GPa^-1	—	tentative linear fitting	Text Approximate	main p.5 / article p.345 · Photophysical properties · Fig. 4a
LE-band pressure red-shift slope	-323 cm^-1 GPa^-1	—	tentative linear fitting	Text Approximate	main p.5 / article p.345 · Photophysical properties · Fig. 4a
Ambient-pressure high-energy emission band	asymmetric broadband centered approximately at 465 nm	—	approximately	Text Approximate	main p.5 / article p.345 · Photophysical properties · Fig. 3
Emission recovery on decompression	Band positions and total intensity almost recovered; relative HE/LE intensities differ and LE remains at AP.	—	—	Text Qualitative	main p.6 / article p.346 · Photophysical properties · Fig. 3
Integrated emission intensity drop under pressure	approximately 85% decrease from AP to 6.7 GPa	—	approximately	Text Approximate	main p.6 / article p.346 · Photophysical properties · Fig. 4b
Pressure-induced low-energy band	additional low-energy band around 650 nm	—	around	Text Approximate	main p.1 / article p.341 · Abstract · Fig. 3
Low-energy band onset pressure	0.18-0.19 GPa	—	0.18-0.19 GPa	Text Range	main p.5 / article p.345 · Photophysical properties · Fig. 3
Third high-pressure band	445 nm at around 3.0 GPa	—	around 3.0 GPa	Text Rounded Reported	main p.5 / article p.345 · Photophysical properties · Fig. 3

Solid-state emission spectra versus temperature

CP1 precipitated bulk solid / polycrystalline powder · Powder

Excitation at 390 nm for temperature-dependent spectra; spectra from room temperature/300 K to liquid nitrogen temperature/80 K.

Temperature: 300 to 80
Atmosphere: Vacuum cryostat used for cooling.
Geometry: Spex Fluorolog II with 450 W Xe lamp, two 0.22 m monochromators and PMT detector.
Context: pristine CP1 powder
Measurement source: main p.4 / article p.344 · Photophysical properties · Fig. 2; Fig. S9

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Low-temperature emission peak	480 nm at 80 K	—	—	Text Rounded Reported	main p.4 / article p.344 · Photophysical properties · Fig. 2
Room-temperature emission peak	weak broadband at 468 nm at RT	—	—	Text Rounded Reported	main p.4 / article p.344 · Photophysical properties · Fig. 2
Emission peak shift on cooling	Delta = 12 nm at 80 K	—	—	Text Rounded Reported	main p.4 / article p.344 · Photophysical properties · Fig. 2
Thermochromism reversibility	Blue at RT and green-blue at 80 K; fully reversible.	—	—	Text Qualitative	main p.4 / article p.344 · Photophysical properties · Fig. 2

3 measurement groups · 13 results