Silicone Encapsulants for LED Packaging Patents: Leaders & Gaps 2026
- Concentration is modest. the top 5 assignees hold 21.7% of the 1,781 records in scope and the top 10 hold 30.4% — a long tail of single- and few-filing entrants fills the rest.
- Filing has cooled from its 2017 peak. 153 records that year against 77 in 2021 and 18 in 2024, a -77% move over that three-year span (2025-26 figures are still filling in under publication lag).
- Claims cluster outside the encapsulant class itself. 44.7% of records sit in H01L (semiconductor devices) versus only 11.0% in C08L (polymer compositions), showing most protection is built around the device, not the material.
Filing growth compares 2021 (77 records) with 2024 (18) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 1,781 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 1,781 published records at the intersection of silicone chemistry and LED packaging — filings that reference optical silicone, LED encapsulation or die-attach materials alongside performance criteria such as refractive index, yellowing resistance, gas permeability, phosphor settling or thermal shock. It spans the period from 2015 through the 2026 data cut-off, so the most recent one to two years are necessarily incomplete.
The claims here span two distinct layers: the encapsulant material itself (polymer composition, additive packages, cure chemistry) and the device architecture that the encapsulant sits inside (die attach, optical elements, lighting components). Reading the IPC composition against the assignee ranking together shows where a filer is more likely to collide with dense prior art versus where a first claim still has room to stand.
Filing trend and technology composition
Two views of the same 1,781-record dataset: how filing volume has moved year over year, and how those records distribute across IPC subclasses.
Filing trend: a 2017 peak followed by a multi-year pullback
Filings peaked at 153 in 2017. By 2021 the annual count had fallen to 77, and by 2024 — the last year that can be treated as complete given an ~18-month publication lag — it stood at 18, a -77% move over that span. Treat 2025 and 2026 counts as undercounts still filling in rather than evidence of a continued decline.
IPC composition: device and optics classes dominate over the material class
H01L (semiconductor devices) appears in 44.7% of the 1,781 records, well ahead of F21V (lighting device components) at 17.3% and G02B (optical elements & systems) at 15.6%. The polymer-specific classes — C08L, C08G and C08K — each sit between 8% and 11%, meaning filers are more often protecting the encapsulant as part of a device claim than as a standalone composition claim. Records can carry more than one class, so these shares sum to well over 100%.
Shares are the percentage of the 1,781 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Silicone Encapsulants for LED Packaging with Eureka
This page is one run against one query. Ask Eureka your own question about silicone encapsulants for led packaging and every answer comes back with the patent numbers behind it.
Try EurekaA representative early claim on refractive index
High-refractive-index optical silicone oil and high-refractive-index optical silicone oil mixture
The filing claims a high-refractive-index optical silicone oil built on a pentasiloxane backbone with aralkyl substituents, delivering a refractive index of 1.45 to 1.50 at 25°C, plus a mixture form combining the pentasiloxane with a matched disiloxane at the same refractive index range, along with preparation methods for both.Filed 2002 — an early marker in the refractive-index-tuning branch that later filings in C08G and C08K continue to build around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100317132A1 | Printed Assemblies of Ultrathin, Microscale Inorganic Light Emitting Diodes for Deformable and Semitransparen… | 853 |
| 2 | US6657236B1 | Enhanced light extraction in LEDs through the use of internal and external optical elements | 810 |
| 3 | US8865489B2 | Printed assemblies of ultrathin, microscale inorganic light emitting diodes for deformable and semitransparen… | 358 |
| 4 | US20130069088A1 | Light emitting diode with conformal surface electrical contacts with glass encapsulation | 356 |
| 5 | WO2010132552A1 | Printed assemblies of ultrathin, microscale inorganic light emitting diodes for deformable and semitransparen… | 350 |
| 6 | US6821804B2 | Enhanced light extraction in LEDs through the use of internal and external optical elements | 338 |
| 7 | US7923741B1 | Semiconductor lighting device with reflective remote wavelength conversion | 300 |
| 8 | US6204523B1 | High stability optical encapsulation and packaging for light-emitting diodes in the green, blue, and near UV … | 266 |
| 9 | US20070274063A1 | Lighting device and method of making | 263 |
| 10 | US7224000B2 | Light emitting diode component | 261 |
Citation counts favour older records simply by virtue of having had more time to accumulate them — read this as a map of influence within the searched corpus, not a ranking of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Four read-outs from the concentration, trend and citation figures above, each pointing to a different decision a filer or licensor would need to make.
No single assignee controls the field
With the leader at 128 records and tenth place at 28, the ranking falls off quickly after the top few names. The remaining 1,781-record dataset is filled by a long tail of companies filing in single digits — the field is contestable, not locked up.
Volume has pulled back sharply from its peak
The -77% move from 77 records in 2021 to 18 in 2024 is a real contraction in complete-year data, not a publication-lag artefact. Newer entrants are filing into a quieter environment than the one that produced the 2017 peak.
Device-layer claims outnumber material-layer claims
Only 11.0% of records sit in C08L (polymer compositions) against 44.7% in H01L. A pure composition-of-matter claim on the silicone itself competes with far less prior art than a device claim wrapping the same material.
Influence skews toward older display and extraction patents
The most-cited records date to the display-integration and light-extraction era rather than recent phosphor-settling or thermal-shock filings. That is expected of citation counts inside any searched corpus and should not be read as a signal of current commercial weight.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicone encapsulants for led packaging, with the prior art for and against each one.
Who is filing, and where the gate sits for new entrants
The assignee ranking covers 100 companies drawn from the 1,781 records in scope. Momentum has cooled across the names with the largest historical volume, which is consistent with the broader -77% pullback rather than any one company's retreat.
A clear leader, but not a lock on the field
The top assignee's 128 records are well ahead of fifth place at 42 and tenth at 28 — a real gap at the very top, but one that still leaves 69.6% of all 1,781 records outside the top 10 combined.
Even established filers show a quiet latest year
Several of the assignees with the deepest historical filing records show zero recorded activity in the latest tracked year, including firms with -100% year-on-year moves. This tracks with publication lag as much as with any strategic pullback.
Co-filing is limited and academic-leaning
The strongest co-assignee pairs in this dataset link a university with an affiliated institute or spin-out rather than two competing manufacturers, suggesting most commercial filers are protecting encapsulant IP independently rather than through joint filings.
| Assignee | Recent year | YoY |
|---|---|---|
| Ledil | 0 | -100% |
| Wolfspeed Inc | 0 | — |
| Dow Silicones Corp | 0 | -100% |
| University of Rochester | 0 | — |
| LG Chem Ltd | 0 | — |
| Morgan Solar Inc | 0 | — |
| Nanotech Ltd | 0 | — |
| 3M Innovative Properties Co | 0 | — |
Where to take this analysis
The dataset points to two practical next moves: checking a specific claim against the composition-heavy classes, and mapping which sub-areas still have room for a first filing.
Run a freedom-to-operate check on a specific formulation
Cross the C08L/C08G/C08K composition classes against a target refractive-index or cure-chemistry claim before drafting, since these classes carry the densest material-level prior art in this dataset.
Check claims in Eureka →Track momentum on the leading assignees
Several top filers show a zero-activity latest year; watching whether that persists past the publication-lag window will tell you whether the -77% pullback is a field-wide trend or concentrated in a few names.
Monitor assignees in Eureka →Common questions on silicone encapsulant patents
The assignee ranking in this dataset covers 100 companies drawn from 1,781 records, with the leader holding 128 records against 42 at fifth place and 28 at tenth. That is a real gap at the top, but the top 10 combined still account for only 30.4% of all records in scope, so no single company controls the field. A freedom-to-operate search should still check the leading names first, then widen to the long tail of few-filing entrants that make up the rest.
Filing peaked at 153 records in 2017 and has fallen since, with complete-year data showing 77 records in 2021 down to 18 in 2024 — a -77% move. Because publication lags filing by roughly 18 months, 2025 and 2026 counts in any such dataset are undercounts and should not be read as confirming a further decline. The honest read is that the field has cooled meaningfully from its 2017 peak, based on the last fully-reported years.
It claims a high-refractive-index optical silicone oil built on a pentasiloxane backbone with aralkyl substituents, achieving a refractive index of 1.45 to 1.50 at 25°C, along with a mixture form pairing the pentasiloxane with a matched disiloxane at the same index range, plus methods of preparing both. It is an early, narrowly-drawn composition claim rather than a broad platform patent, so it primarily blocks close analogues of that specific siloxane structure and index range rather than optical silicones generally.
IPC density is heavily weighted toward device-layer classes — 44.7% of the 1,781 records carry an H01L semiconductor-device class — while material-specific classes like C08L sit at only 11.0%. That gap suggests under-claimed room in standalone composition and additive-package claims, particularly around phosphor-settling control, gas-permeability barriers and thermal-shock-resistant die-attach interfaces, rather than in device-integration claims where H01L, F21V and G02B prior art is already dense.
A single patent record commonly carries several IPC classification codes at once — for example, a filing claiming an encapsulant material used in a specific LED device architecture might be classified under both C08K (additives) and H01L (semiconductor devices). Each class share here is calculated against the same 1,781-record total, so the shares are individually accurate even though they sum to well over 100% collectively. This is standard for IPC-based composition charts and should not be read as an error.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.