Climate Change Capital's private equity arm confirmed it has invested £6 million in the funding round for Cambridge-based Nujira.
Existing backers Amadeus, NES Partners, Environmental Technologies Fund and private investors provided the rest of the funding.
"This funding round gives us the resources we need to build on our success and make Coolteq the power optimisation technology of choice in smartphones and other data-oriented devices," commented Nujira chief executive Tim Haynes.
Nujira develops energy-efficient radio frequency transmitters for mobile phones, wireless infrastructure and digital broadcast applications.
In other industry news, Vodafone Group Plc, the world's largest mobile phone company, has reported a smaller-than-estimated decline in full-year profit.
Before interest, taxes, depreciation and amortization, earnings fell 0.4 per cent to £14.7 billion from a year earlier.
Posted by Andre Dixon
