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浙江大学研制出高效微纳钙钛矿LED

浙江大学团队通过新型半导体技术研制出90nm像素尺寸的微米和纳米钙钛矿LED,刷新了最小像素尺寸记录,成果发表于《自然》期刊。

媒体报道
浙江大学研发出微米和纳米钙钛矿 LED,为迄今为止已公开最小 LED 像素 IT 之家
浙江大学研发出微米和纳米钙钛矿LED,为迄今为止已公开最小LED像素 凤凰科技
浙江大学研制出高效微纳钙钛矿LED 财联社/格隆汇

事件追踪
2025-02-28 复旦大学科研团队实现新型纳米颗粒超晶格
2025-02-20 我国学者攻克纯红光钙钛矿LED技术难题
2025-02-05 西湖大学团队在柔性叠层太阳电池领域取得重要突破
2024-08-03 我国科研团队成功突破新型太阳能电池制备难题

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Telegram auto-delete message, expiring invites, and more

elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.

Should I buy bitcoin?

“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.

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