- ▸ Photoimaging of color-filter and black-matrix resists in LCD/OLED display manufacturing
- ▸ Initiator for deeply pigmented and black UV-curable inks and coatings
- ▸ Curing of photoresists and printing-plate resins
- ▸ Through-cure of highly filled UV-curable plastics
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →
This carbazole oxime ester is an ultra-high-sensitivity Type I photoinitiator for advanced photoresists and displays. The carbazole chromophore red-shifts and strengthens absorption, making it one of the most efficient initiators for heavily pigmented color-filter and black-matrix resists. Identity: PubChem / CAS 478556-66-0.
What it is
1-[9-Ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]ethanone 1-(O-acetyloxime) (CAS 478556-66-0) is a carbazole-based oxime ester, a yellow solid. The carbazole core gives strong, red-shifted absorption versus simple oxime esters.
How it cures
A Type I initiator: UV photolysis cleaves the oxime-ester N–O bond to release radicals very efficiently, and the carbazole chromophore both red-shifts absorption and boosts quantum yield — so it cures heavily pigmented resist films at low loadings, with no amine needed.
Applications
Used in high-end color-filter resists, LCD/OLED black matrix, photoresists and microelectronics imaging, where maximum photosensitivity through pigment is required. Compare the OXE-01-type oxime ester.
Forms, grades and handling
It is supplied as a yellow solid. Photoinitiators are light-sensitive — store cool, dry and dark, away from light and ignition sources. Handle per the current Safety Data Sheet (SDS); each lot ships with a Certificate of Analysis (CoA) and Technical Data Sheet (TDS).
Bulk supply and RFQ
RawSource sources Carbazole Oxime-Ester Photoinitiator direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your lamp (mercury or LED wavelength), system (clear or pigmented) and cure target, and we will quote the right grade. Compare the full range and selection logic in the photoinitiators guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / type | Photoinitiator (Type I, carbazole oxime ester) |
| Photoinitiator type | Type I (cleavage), carbazole oxime ester |
| Absorption | Near-UV / longer UV — very high sensitivity |
| CAS Number | 478556-66-0 |
| Molecular Formula | C26H24N2O3 |
| Molecular Weight | 412.5 g/mol |
| Handling | Light-sensitive; refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 455-590-6
TSCA Inventory flag PMN: a commenced PMN (premanufacture notice) substance (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is the carbazole oxime-ester photoinitiator used for?
It is an ultra-high-sensitivity Type I carbazole oxime-ester photoinitiator (CAS 478556-66-0) used in high-end color-filter resists, LCD/OLED black matrix and microelectronics photoresists, curing heavily pigmented films at low loadings.
Why is the carbazole oxime ester so sensitive?
Its carbazole chromophore red-shifts and strengthens absorption while the oxime ester cleaves efficiently, giving very high quantum yield — ideal for the most demanding pigmented resist films.
How is bulk this carbazole oxime-ester photoinitiator supplied and quoted?
RawSource supplies this carbazole oxime-ester photoinitiator in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your target quantity.
What is the REACH and TSCA regulatory status of Carbazole Oxime-Ester Photoinitiator?
Carbazole Oxime-Ester Photoinitiator (CAS 478556-66-0) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 455-590-6).