Detect presence of Passive HF/LF RFID TAG with BT 4.0 (NFC not supported)
RFID and BLE are two very different technologies, so no, you can't do that.

However.

There are already BLE devices that works somewhat like RFID or NFC tags. These are called beacons. One specific technology is iBeacon developed by guess who :)

Beacons work by sending BLE advertisement packages. These packages can contain some user data.

I've recently developed a device that includes battery voltage info in the advertisement packets, so you don't even have to connect to it just to check on the battery level.

Take a look at Bluegiga's BLE112 / BLE113 devices and related development / breakout boards. They make BLE development super easy.

If you want to create a tag that can be seen from a short distance, you can set some arbitrary advertisement data that you can recognize, and set the radio tx level very low, so it can only be seen from like 10 meters.